Direct Conclusion & Objective: If a 138 Enterprise Email account is sending bulk spam, it strongly indicates that the account credentials or a connected third-party client have been compromised. The immediate objective is to contain the breach, halt unauthorized outbound traffic, and secure the account perimeter.

Root Causes & Evidence Checks: Bulk spam sending typically occurs due to weak passwords, phishing attacks, or malware on a local device. Before proceeding, administrators should verify the scope of the issue by checking the login, attack, and sending logs to record the time, IP addresses, and specific behaviors associated with the unauthorized sending.

Immediate Action Plan (Solutions):

1. Credential Reset: Immediately change the password and revoke suspicious clients or client-specific passwords. Administrators can log in, navigate to "Organization & Users - User Management", open the target account, and set a new password. Alternatively, users can reset it via "Personal Settings". The new password must be at least 8 characters long and include letters, numbers, and special symbols.
2. Revoke Third-Party Access: If the user accesses email via third-party standard protocol clients, ensure that client-specific passwords are regenerated or revoked to cut off unauthorized connections.
3. Audit Account Configurations: Thoroughly check auto-forwarding, filtering rules, aliases, and security verification information. Attackers often set up hidden forwarding rules to intercept replies or maintain persistence.

Service Boundaries & Limitations: Please note that 138 official customer service typically does not directly reset passwords for standard sub-accounts; this must be handled by your enterprise administrator. If the primary administrator account is compromised and the bound phone is unavailable, you must apply for a reset using the contract-registered email to the official support channel for verification.

Next Steps & Recommendation: Once the account is secured, verify that your domain's sender authentication mechanisms—specifically SPF, DKIM, and DMARC—are correctly configured and enforced to prevent domain spoofing. We recommend establishing a routine employee phishing awareness process and enforcing multi-factor authentication for high-risk accounts such as finance and management.

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Direct Conclusion:
To interpret DMARC reports for your corporate email, you must analyze the XML aggregate reports to identify source IPs failing SPF or DKIM alignment, determine whether these IPs belong to legitimate third-party services or malicious spoofers, and update your DNS records or block unauthorized senders accordingly.

Before Adoption (Preparation & Conditions):
138 Enterprise Email officially supports sender authentication mechanisms including SPF, DKIM, and DMARC. Before analyzing reports, ensure you have configured and verified your SPF and DKIM records. It is highly recommended to deploy DMARC in phases, starting with a monitoring-only policy (p=none) to collect data without disrupting legitimate email delivery.

During Adoption (Analysis & Checks):
When reviewing the parsed DMARC reports, focus on the following diagnostic steps:

• Identify Failing IPs: Check the source IPs that failed SPF/DKIM. If they belong to your CRM, ERP, or marketing platforms, add them to your SPF record or configure DKIM signing for those services.
• Investigate Auto-Forwarding: If internal emails fail SPF after being forwarded, note that enterprises must evaluate the confidentiality and compliance risks of forwarding emails to personal addresses. Auto-forwarding often breaks SPF alignment and should be restricted or replaced with proper alias routing.
• Detect Account Compromise: If you see unknown IPs sending emails on behalf of your domain, administrators should check auto-forwarding rules, login IPs, sent emails, and exception logs in the 138 admin console to verify if an account is compromised.

After Adoption (Boundaries & Next Steps):
DMARC reports are retrospective and do not instantly block phishing. They should be used alongside 138 Enterprise Email's built-in spoofed email identification and unknown sender alerts. Once you have resolved all legitimate sending sources and mitigated compromised accounts, gradually upgrade your DMARC policy from p=none to p=quarantine and eventually p=reject. For complex routing or migration scenarios, consult the 138 official support team to verify specific DNS configurations.

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The primary purpose of unfamiliar sender alerts on 138 Enterprise Email is to proactively identify and flag incoming messages from unknown, unverified, or potentially spoofed external addresses before they reach the end-user's primary inbox. For scaling enterprises, foreign trade, and cross-border business teams, this feature acts as a critical first line of defense against Business Email Compromise (BEC) and phishing attacks, ensuring that employees do not blindly trust emails that mimic internal domains or trusted partners.
A common failure during enterprise scale expansion is the influx of targeted phishing emails that bypass basic spam filters because they do not contain malicious links or known virus signatures. Instead, they rely heavily on social engineering. When an organization rapidly onboards new staff or expands into new global markets, employees are more likely to receive emails from genuinely new contacts. Without unfamiliar sender alerts and spoofing identification, staff may mistake a spoofed executive or vendor email for a legitimate request, leading to unauthorized wire transfers or credential harvesting. The alert system mitigates this by cross-referencing sender domains against the organization's approved contact list and checking authentication protocols.
When an unfamiliar sender alert is triggered, IT implementation and maintenance managers must treat it as a potential security event rather than a mere notification. The following corrective actions should be executed:

1. Verify Sender Authentication: Check if the flagged email failed SPF, DKIM, or DMARC validations. 138 Enterprise Email supports these sender authentication mechanisms, and failures often indicate domain spoofing.
2. Establish a Reporting Workflow: As part of your security baseline, establish an employee phishing email identification and reporting process. Users should be trained to forward flagged emails to the IT security team rather than replying or clicking links.
3. Investigate Account Compromise: If the alert indicates that an internal account is receiving unusual bounce-backs or if the alert is triggered by internal-to-internal spoofing, suspect an account breach. In such cases, immediately check login, attack, and sending logs to record the time, IP, and behavior.
4. Enforce Password Resets and Client Controls: If any compromise is suspected, the affected user must change their credentials immediately. Users can log into the web client, navigate to 'Personal Settings - Personal Information - Email Password', and enter the original password along with two entries of the new password to save it. The system recommends a minimum of 8 characters, including letters, numbers, and special symbols. Additionally, IT admins must ensure that third-party email clients use dedicated client-specific passwords and that protocol permissions are strictly controlled.

It is important to note the service boundaries of this feature. Unfamiliar sender alerts are an identification and warning mechanism, not an absolute block. The final decision to quarantine or delete the email depends on the administrator's configured anti-spam and anti-virus policies. Furthermore, while 138 Enterprise Email provides the technical alerts, the organizational enforcement—such as out-of-band verification for high-risk operations like payment changes—remains the responsibility of the enterprise's internal management.
For IT managers conducting a risk review, the next step is to audit your current 138 Enterprise Email security baseline. Ensure that unfamiliar sender alerts are enabled for all high-risk departments, including finance, procurement, and executives. If you need assistance configuring these security policies or reviewing your domain's DMARC deployment, contact the officially direct-operated 138 Enterprise Email support team for technical guidance.

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Direct Conclusion: When evaluating direct-operated versus reseller enterprise email models, the core differences lie in identity verification, account scaling flexibility, and security boundaries during daily management. 138 Enterprise Email operates on an officially direct-operated model without agents, ensuring that all purchasing, activation, and technical support processes are handled directly by the official team. This eliminates third-party intermediaries, providing stricter data security and transparent pricing for both registered enterprises and individual operators.

Prerequisites and Preparation: Regardless of the model, enterprise email requires a manageable custom domain. If you do not own one, it must be registered first. Under the direct-operated model, identity verification is conducted strictly between the buyer and the official provider. For enterprise buyers, this involves submitting a business license and signing a direct purchase contract. Individual operators (such as foreign trade SOHO or freelancers) can also purchase directly, starting from just one account, but must complete personal identity verification according to current compliance requirements. In contrast, reseller models often require sharing sensitive business documents with third-party agents, which may introduce compliance risks.

Implementation and Service Boundaries: During daily use, the direct model provides clearer security boundaries and operational protocols. For instance, if an administrator forgets their password and has not bound a mobile phone, the direct model requires the administrator to apply for a reset using the contract-registered email directly to the official support address (kf@138.gz.cn). The official team verifies the request and processes it, explicitly advising users never to send passwords or verification codes to non-official personnel. In a reseller model, such critical security operations might be routed through the agent, increasing the risk of unauthorized access. Furthermore, when scaling up, the direct model allows adding accounts during the service period with costs calculated based on official current quotations and contract adjustments, avoiding hidden reseller markups or rigid minimum purchase constraints.

Next Steps: To proceed with a direct-operated enterprise email setup, first ensure your custom domain is registered and manageable. Prepare your business license (for enterprises) or personal identification (for individual operators). Contact the official 138 Enterprise Email portal directly to confirm the required verification materials, review the current pricing for your specific account count, and initiate the secure, direct activation process without third-party involvement.

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Direct Conclusion: When SPF (Sender Policy Framework) verification fails, your enterprise emails are at a high risk of being marked as spam or rejected by recipient servers. The immediate action is to audit your domain's DNS TXT records for syntax errors, duplicate SPF records, or missing 138 Enterprise Email sending server IPs, and correct them using the official configuration parameters.

Root Causes of SPF Verification Failure

For implementation and maintenance managers troubleshooting custom domain email delivery, SPF failures typically stem from the following DNS misconfigurations:

• Multiple SPF Records: DNS standards strictly allow only one SPF TXT record per domain. If your domain has multiple records (e.g., one for 138 Enterprise Email and another for a legacy system), all SPF checks will fail.
• Missing or Incorrect 'Include' Mechanisms: If your domain uses 138 Enterprise Email for global email communication, the SPF record must explicitly include 138's sending servers. An outdated or misspelled include value will cause verification to fail.
• Exceeding the 10 DNS Lookup Limit: The SPF protocol limits DNS lookups to 10 per evaluation. Using too many nested include, a, or mx mechanisms across various third-party services will trigger a permanent error.
• Syntax and Qualifier Errors: Extra spaces, missing v=spf1 at the beginning, or incorrect use of qualifiers (like using -all when you meant to use ~all during a transition phase) will invalidate the record or cause unintended hard bounces.

Step-by-Step Troubleshooting and Fixes

1. Audit Existing DNS Records: Log in to your domain registrar's DNS management console. Search for TXT records starting with v=spf1. If you find more than one, merge them into a single, consolidated record.
2. Verify 138 Enterprise Email Parameters: Ensure the official 138 Enterprise Email include domain is correctly added. Since 138 provides officially direct-operated services without agents, you should obtain the exact, up-to-date SPF include string directly from the 138 official service portal or technical support team.
3. Optimize DNS Lookups: If you use multiple third-party email services alongside 138 Enterprise Email, flatten your SPF record or remove obsolete mechanisms to stay strictly under the 10-lookup limit.
4. Check Subdomain Configurations: If you are sending emails from a subdomain, ensure that the subdomain has its own valid SPF record or explicitly inherits the root domain's policy, depending on your organizational routing setup.
5. Test and Propagate: After updating the record, use an SPF validation tool to check for syntax errors. Note that DNS propagation can take up to 48 hours, though it usually completes much faster.

Security Boundaries and Compliance Baseline

It is crucial to understand the boundaries of SPF: it only verifies the IP address of the sending server; it does not protect the "From" display name from being spoofed. According to the 138 Enterprise Email security baseline, enterprise administrators must configure and verify both SPF and DKIM, and deploy DMARC in phases. Relying solely on SPF is insufficient for organizations with strict requirements for email security and compliance, such as foreign trade and cross-border business teams. Furthermore, 138 Enterprise Email supports sender authentication mechanisms including SPF, DKIM, and DMARC, alongside spoofed email identification and unknown sender alerts, to provide comprehensive protection against business email compromise. Additionally, administrators should leverage the centralized account management features to enforce strong password policies and restrict IP login ranges.

Next Steps and Official Support

If the SPF record appears correct but verification still fails, do not guess or modify records blindly. Contact the officially direct-operated 138 Enterprise Email technical support team. They can provide precise configuration parameters, assist with global multi-node delivery diagnostics, and ensure your custom domain email meets the required information security evaluation standards for enterprise communication.

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Direct Conclusion

If you receive a suspicious email appearing to be from your CEO or executive team requesting urgent wire transfers, credential resets, or sensitive data, do not reply or execute the request. Immediately verify the instruction through an out-of-band channel (e.g., a direct phone call or internal enterprise messaging). If you suspect an executive's 138 Enterprise Email account has been compromised, the enterprise administrator must immediately reset the password, revoke active third-party client sessions, and audit all mailbox forwarding rules.

Objectives and Context

Business Email Compromise (BEC) and executive impersonation (often called 'fake boss emails') represent a critical threat to enterprise financial security and data privacy. The primary objective of this protocol is to halt unauthorized transactions, secure the compromised communication vector, and leverage 138 Enterprise Email's native security architecture to prevent future domain spoofing. This guidance is designed for enterprise IT administrators, financial controllers, and compliance officers managing cross-border or domestic operations.

Evidence and Cause Analysis

Impersonation attacks typically succeed due to two main vulnerabilities:

1. Domain Spoofing: Attackers send emails from external servers forging the executive's email address. This occurs when the enterprise domain lacks strict DNS-based authentication records, allowing malicious actors to bypass basic spam filters.
2. Account Compromise: Attackers gain actual access to the executive's mailbox via phishing or credential stuffing. Once inside, they study communication patterns and launch highly targeted requests to the finance department.

Alternatives and Recommended Solutions

To mitigate these risks, enterprises must implement a combination of technical controls and process baselines using 138 Enterprise Email's officially direct-operated platform:

1. Technical Controls (Authentication & Alerts)

138 Enterprise Email officially supports sender authentication mechanisms including SPF, DKIM, and DMARC. Administrators must configure these protocols in their domain's DNS settings to reject or quarantine unauthenticated emails. Furthermore, administrators should enable the platform's built-in spoofed email identification and unknown sender alerts. These features visually flag external or suspicious senders, providing an immediate warning to employees before they interact with a potentially fraudulent message.

2. Process Baselines (Identity & Verification)

According to 138 Enterprise Email's security deployment guidelines, finance, executive, procurement, and administrator accounts must strictly avoid shared accounts and passwords. Each user must have a unique, strong password and utilize secondary verification where available. Crucially, high-risk operations such as payments, account modifications, or credential resets must mandate out-of-band verification, regardless of the email's apparent origin.

Implementation and Incident Response Steps

If an executive account is suspected to be compromised, execute the following incident response sequence immediately:

1. Immediate Containment: The enterprise administrator must log into the 138 backend to reset the compromised account's password and revoke any suspicious third-party client authorizations or dedicated app passwords.
2. Configuration Audit: Thoroughly check auto-forwarding rules, filtering rules, aliases, and security verification information. Attackers frequently use these to silently monitor replies or divert sensitive communications.
3. Log Review: Analyze the login logs, attack logs, and sent mail logs to identify the breach's origin IP, timestamp, and the scope of unauthorized outbound communications.

Service Boundaries and Next Steps

While 138 Enterprise Email provides a secure, certified infrastructure (holding certifications such as the National Information Security Evaluation EAL3+ and MLPS Level 3), the actual enforcement of DMARC policies requires the enterprise's DNS administrator to correctly publish the TXT records. Additionally, please note the service boundary regarding password resets: official 138 customer support does not directly reset passwords for ordinary sub-accounts. Sub-account password resets must be handled by the enterprise administrator, or by the user via their bound mobile phone.

Next Step: Log in to your 138 Enterprise Email admin portal today to verify your SPF/DKIM status and enable unknown sender alerts. For assistance with domain configuration or security audits, contact the official direct-operated support team through the official service portal.

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When dealing with phishing emails or suspected account compromises on 138 Enterprise Email, the immediate priority is containment. Direct Answer: If an employee reports a phishing email or you suspect an account has been compromised, immediately reset the affected user's password, revoke all active third-party client sessions (including client-specific passwords), and inspect the account for unauthorized forwarding rules. Following containment, administrators must review system logs to determine the scope of the breach and enforce domain-level authentication protocols to prevent future spoofing.

Signals: Identifying Phishing and Spoofing Attempts

Phishing often relies on domain spoofing or compromised internal accounts. 138 Enterprise Email provides native security mechanisms to help users identify these threats, including spoofed email identification and unknown sender alerts. Additionally, the platform processes spam and virus filtering at the gateway level. However, highly targeted spear-phishing may bypass standard filters if the attacker uses a newly registered look-alike domain or if an internal account has already been compromised.

Evaluation Criteria: Incident Response Checklist

For technical evaluators and IT administrators scaling enterprise email security, follow this structured response protocol when a phishing incident occurs:

• 1. Credential Reset and Session Revocation: Immediately change the compromised account's password via the admin console. Crucially, you must also revoke any suspicious third-party client connections or client-specific passwords that may have been generated by the attacker to maintain persistent access.
• 2. Inspect Rules, Forwarding, and Aliases: Attackers frequently set up hidden auto-forwarding rules or inbox filters to intercept sensitive communications and delete the originals. Check the compromised account's settings for any unauthorized auto-forwarding addresses, filtering rules, or newly created aliases.
• 3. Analyze Security and Activity Logs: Utilize the admin console to review login, attack, and sending logs. Record the timestamps, IP addresses, and specific behaviors to understand how the attacker gained access and what data was exfiltrated.

Preventive Configuration and Risk Mitigation

To reduce the risk of successful phishing and spoofing attacks across your organization, implement the following baseline configurations:

• Domain Authentication: Configure and verify SPF and DKIM, and progressively deploy DMARC to prevent attackers from spoofing your corporate domain.
• Access Controls: Enforce strong password policies and enable continuous error lockouts. For high-risk accounts (executives, finance, administrators), mandate multi-factor authentication and prohibit shared accounts.

Service Boundaries and Shared Responsibility

It is critical to understand the delivery boundaries of 138 Enterprise Email. The platform provides the technical infrastructure, including anti-spam engines, IP restriction capabilities, and security alerts. However, technical controls cannot eliminate human error. 138 Enterprise Email explicitly advises that high-risk operations—such as processing payments, changing bank account details, or resetting credentials—must be verified through out-of-band channels (e.g., a phone call). The enterprise is responsible for establishing internal employee training and operational verification workflows.

Next Steps

If the administrator account itself is compromised, or if you require deeper forensic log extraction, contact the official 138 Enterprise Email support team. For critical account recovery, use the contract-registered email to contact kf@138.gz.cn. Do not share passwords or verification codes with unofficial personnel. For ongoing scaling, schedule a quarterly review of your DMARC policies and third-party client access permissions.

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Handling suspicious login alerts promptly is a critical component of enterprise email security and compliance management. For organizations utilizing 138 Enterprise Email for global communication, a structured incident response minimizes the risk of data breaches and financial fraud.

Direct Conclusion
When a suspicious login is detected on 138 Enterprise Email, the immediate priority is threat containment. Administrators or affected users must instantly change the account password, revoke any suspicious third-party client authorizations or app-specific passwords, and audit mailbox rules to prevent unauthorized data exfiltration or spoofed sending.

Prerequisites and Scope
This response protocol applies to enterprise administrators and individual users managing custom domain emails via the 138 Enterprise Email web portal. Effective execution relies on the platform's built-in security features, including login logs, attack logs, and client-specific password management. It is particularly critical for foreign trade and cross-border business teams where Business Email Compromise (BEC) can lead to severe financial losses.

Step-by-Step Implementation Path

Step 1: Immediate Credential Reset and Revocation
Action: Log into the 138 Enterprise Email web client. Navigate to Personal Settings (for users) or Organization & User Management (for admins) to set a new, strong password (at least 8 characters combining letters, numbers, and symbols).
Checkpoint: Immediately revoke or regenerate any client-exclusive passwords used for third-party standard protocol clients (e.g., Outlook, mobile mail apps) to cut off unauthorized IMAP/POP3/SMTP access.

Step 2: Audit Mailbox Rules and Forwarding
Action: Inspect the compromised account for hidden persistence mechanisms left by intruders.
Checkpoint: Check auto-forwarding settings, filtering rules, aliases, and security verification information. Attackers often set up silent forwarding to external addresses to monitor business communications and intercept invoices.

Step 3: Log Forensics and Analysis
Action: Utilize the 138 Enterprise Email admin console to investigate the breach scope.
Checkpoint: Review login, attack, and sending logs. Record specific timestamps, source IP addresses, and anomalous behaviors. This data is critical for internal compliance reporting and assessing whether sensitive business data was exposed.

Step 4: Reinforce Security Baselines
Action: Prevent recurrence by elevating the account's security posture.
Checkpoint: Ensure sender authentication mechanisms (SPF, DKIM, DMARC) are correctly configured for your custom domain to prevent spoofing. Enable secondary verification for admins and high-risk accounts (e.g., finance, executives, procurement).

Service Boundaries and Exceptions
Admin Password Loss: If the administrator forgets their password and has not bound a mobile phone, they cannot use the self-service reset. They must use the contract-registered email to apply to the official support at kf@138.gz.cn for manual verification and reset.
Sub-account Limits: Official customer service does not directly reset passwords for ordinary sub-accounts; these must be handled by the enterprise's internal email administrator. Never send passwords or verification codes to non-official personnel.

Next Actions for Compliance and Management
To build long-term resilience, management should establish a clear employee reporting process for phishing and spoofed emails. Furthermore, mandate out-of-band verification (e.g., phone or instant messaging) for high-risk operations triggered via email, such as payment routing changes or credential resets, ensuring your global enterprise communications remain secure and compliant.

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Evaluating the reliability of 138 Enterprise Email for your shortlist requires looking beyond basic storage metrics. As an implementation manager, you should assess its officially direct-operated service model, verifiable security baselines, and strict account management boundaries. Here is a step-by-step evaluation path with checkpoints and constraints.

Step 1: Verify the Direct-Operated Service & Domain Prerequisites

Checkpoint: 138 Enterprise Email operates on an officially direct-operated model without intermediary agents. This ensures that activation, migration, and daily O&M are handled directly by the provider, reducing communication friction and ensuring consistent service quality.

Constraint: The service strictly uses your custom domain as the @ suffix. You cannot create an enterprise email without a domain. If you do not own one, the official team can assist with registration, but you must verify the domain's ownership entity and renewal rights before signing the contract.

Step 2: Assess Security Baselines & Protocol Boundaries

Checkpoint: Reliability in global communication depends on sender authentication. Evaluate if the provider enforces standard protocols. 138 natively supports SPF, DKIM, and DMARC, alongside weak password restrictions and IP-based login limits.

Implementation Boundary: Security is a shared responsibility. Your team must actively configure and verify SPF/DKIM, and phase in DMARC. Furthermore, when integrating third-party standard protocol clients, you must enforce the use of dedicated client-specific passwords rather than primary account passwords to minimize exposure.

Step 3: Evaluate Account Management & Support Exceptions

Checkpoint: Review the provider's support boundaries for account recovery and compliance. Enterprise purchases require business licenses and formal contracts, ensuring legal and operational compliance.

Exception Handling: A critical reliability factor is how support handles compromised accounts. Note that 138 official support will not directly reset passwords for standard sub-accounts. Password resets must be executed by the enterprise administrator or by the user via a bound mobile device. High-risk roles (finance, executives) must be strictly prohibited from sharing accounts.

Next Actions for Your Shortlist

To finalize your evaluation, map your internal IT policies against 138’s native security capabilities. Test the administrator password recovery workflow and review the official DMARC deployment guidelines in the Help Center. Contact the official direct-operated team to request a customized migration and security configuration plan.

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How to Choose a 5-User Business Email Plan for Cross-Regional Collaboration

Direct Conclusion: For a 5-user team—such as a small foreign trade, cross-border e-commerce, or micro-team—selecting an enterprise email plan should prioritize global deliverability, custom domain identity, and strict security baselines over mere storage capacity. 138 Enterprise Email provides officially direct-operated services (without third-party agents) that ensure unified domain identity, centralized account management, and global multi-node delivery, making it highly suitable for small teams requiring robust cross-regional communication.

Scenario Diagnosis: Why Small Cross-Border Teams Face Email Bottlenecks

When a 5-person cross-border team experiences high bounce rates, emails landing in spam, or compromised accounts, the root cause is rarely the number of users. Instead, it stems from using free personal emails or poorly configured basic plans that lack sender authentication and enforce weak password policies. For small teams handling sensitive financial or procurement data, a single compromised account can lead to severe business losses.

Evaluation Criteria & Decision Checklist

When comparing 5-user business email plans, evaluate the following meaningful differences, constraints, and decision criteria:

1. Domain Identity and Registration Constraints

A legitimate enterprise email must use your custom domain as the @ suffix (e.g., name@abc.com). Constraint: You cannot directly create a custom-domain enterprise email without owning and managing a domain first. If your team lacks a domain, 138 Enterprise Email can assist with registration, but domain ownership, pricing, and renewal rights must be confirmed prior to purchase.

2. Security Baselines and Authentication Mechanisms

Do not settle for plans that only offer basic spam filtering. Evaluate if the plan natively supports and enforces:

• Sender Authentication: Configuration and verification of SPF and DKIM, with phased deployment of DMARC to prevent domain spoofing.
• Access Control: Weak password restrictions, continuous error locking, and IP/IP segment restrictions.
• Third-Party Client Security: Support for client-specific passwords and protocol permission controls when using third-party standard protocol clients alongside web and mobile apps.

3. Account Management and Offboarding Boundaries

For a 5-user team, IT maintenance is often handled by a part-time admin. The plan must offer clear self-service boundaries:

• Password Policies: Users must be able to modify passwords via personal settings, adhering to a baseline of at least 8 characters including letters, numbers, and special symbols. Admins can reset passwords via the user management portal.
• Account Deletion: When an employee leaves, admins can delete the account via the portal. Crucial Boundary: Administrators must complete email and business data handover before deletion to prevent data loss.

4. Purchasing Requirements and Direct-Operated Service

Unlike agent-sold plans, 138 Enterprise Email is officially direct-operated. Preparation: Enterprise purchases require a business license and a signed contract. Individual operators can also purchase plans but must complete identity verification. Specific material requirements are subject to current compliance and contract terms.

Implementation Steps & Risk Mitigation

Once the plan is selected, implement the following security baselines immediately:

1. Configure and verify SPF and DKIM records in your domain DNS.
2. Enforce strong passwords and enable secondary verification for the admin and high-risk accounts.
3. Strictly prohibit shared accounts and passwords, especially for finance, procurement, and management roles.
4. Establish an out-of-band verification process for high-risk operations like payment changes or credential resets.

Next Steps

To evaluate the specific 5-user plan that fits your cross-regional needs, or to initiate domain binding and email migration, please visit the 138 Enterprise Email official service portal or contact the official direct-operated support team for a tailored activation and configuration guide.

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Direct Conclusion: To enable DKIM signing for your business email on 138 Enterprise Email, administrators must generate the DKIM key within the admin console and publish the corresponding TXT record in your domain's DNS settings. This cryptographic signature authenticates your outbound messages, ensuring global deliverability and preventing domain spoofing.

Risk Signals & Problem Identification: During an email system replacement or upgrade, missing or misconfigured DKIM records often lead to outbound emails being flagged as spam or rejected by strict receiving servers. If your foreign trade or cross-border teams report sudden delivery failures, or if you receive DMARC failure reports, improper DKIM configuration is a primary suspect.

Evaluation & Setup Steps:

1. Generate Keys: Log in to the 138 Enterprise Email admin portal. Navigate to the domain security settings to generate your unique DKIM public and private key pair.
2. DNS Configuration: Ensure your IT team has full domain and DNS permissions. Add the generated DKIM TXT record to your domain registrar's DNS management console.
3. Verification: Return to the 138 admin console to verify DNS propagation and activate the signing process.
4. Security Baseline Alignment: According to the 138 Enterprise Email security baseline, administrators must configure and verify both SPF and DKIM, followed by a phased deployment of DMARC to establish a comprehensive anti-spoofing defense.

Implementation Boundaries & Conditions:

• Migration Context: When migrating to 138 Enterprise Email, switching MX and related authentication records must be carefully coordinated. Do not delete the old provider's DKIM records until all historical emails in transit are fully delivered and the new 138 DKIM is fully propagated.
• Propagation Delays: DNS TXT record updates can take up to 48 hours to propagate globally. Email sent during this window may lack the new DKIM signature.
• Third-Party Systems: If your business uses external CRM or ERP systems to send automated emails via your custom domain, those specific services must also be aligned with your DKIM and SPF policies.

Next Steps: Send a test email to an external address and inspect the raw email headers to confirm the DKIM-Signature is present and passing. If you lack internal DNS expertise or are managing a complex multi-domain migration, contact the officially direct-operated 138 Enterprise Email support team for professional configuration and troubleshooting assistance.

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Direct Conclusion: When choosing a business email attachment size limit during the initial deployment of 138 Enterprise Email, technical evaluators must balance the operational need for large file transfers against global delivery stability and security constraints, rather than simply maximizing the allowable size.

Conditions and Evaluation Criteria: For standard corporate communication, maintaining a moderate attachment limit ensures faster global multi-node delivery and minimizes the risk of rejection by recipient mail servers. For foreign trade and cross-border business teams that frequently exchange large design documents or catalogs, relying solely on standard SMTP attachment limits is inefficient. Instead, evaluators should compare standard email attachments against secure, link-based large-file sharing modules.

Implementation Boundaries and Security Constraints: 138 Enterprise Email provides officially direct-operated services with robust security features, including anti-virus processing and spoofed email identification. Extremely large attachments can strain spam and virus scanning engines, potentially causing delivery timeouts or triggering security blocks. Additionally, to ensure high deliverability for any attachment size, administrators must strictly configure and verify sender authentication mechanisms like SPF, DKIM, and DMARC. Large payloads sent from unauthenticated custom domains are highly likely to be quarantined by global recipients.

Next Steps: Assess your team's actual file-sharing workflows before finalizing the configuration. Contact the official 138 Enterprise Email service portal to verify the exact attachment size thresholds applicable to your specific plan. Concurrently, ensure your domain's SPF, DKIM, and DMARC records are fully deployed and verified to support secure and reliable global email communication.

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