How should administrators and users handle suspicious login alerts on 138 Enterprise Email to prevent data breaches and unauthorized sending?

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.