How to Verify 138 Enterprise Email Migration: A Step-by-Step Checklist for IT and Compliance Teams

Who This Guide Is For

This guide is intended for IT administrators, compliance officers, and project managers responsible for validating a 138 Enterprise Email migration. It focuses on post-migration verification, troubleshooting common anomalies, and defining clear acceptance boundaries before decommissioning legacy systems.

1. Pre-Verification Baseline

Before switching DNS or decommissioning the old system, confirm the following inventory and permissions:

• Domain ownership and DNS management access.
• Complete list of target accounts, aliases, distribution groups, and forwarding rules.
• Historical data scope: mailboxes, folders, contacts, calendars, and attachments.
• Third-party clients (Outlook, Foxmail, mobile native mail) and business system sending sources.
• Old system export permissions, data retention policies, and any contractual migration limits.

If any item is unclear, pause the cutover and request a formal scope confirmation from the 138 official service team.

2. Account and Access Validation

After accounts are provisioned in 138 Enterprise Email:

• Verify that every target account can log in via the web portal.
• Confirm that usernames are full email addresses and that passwords meet internal security standards.
• Test multi-device access: web, 138 mobile app, 138 PC client, and standard-protocol third-party clients.
• For third-party clients, ensure server addresses, SMTP authentication, SSL/TLS settings, and dedicated app passwords are correctly configured.

If login fails or synchronization is inconsistent, check account status, password policies, and client protocol settings before escalating.

3. DNS, Delivery, and Authentication Checks

Once MX records are updated:

• Monitor internal and external sending/receiving for 24–72 hours.
• Verify that SPF, DKIM, and DMARC records are published and align with 138's sending infrastructure.
• Test cross-border delivery to key regions and confirm that bounce messages are routed correctly.
• Check for spoofed email identification and unknown sender alerts in the admin console.

Authentication misconfigurations are a common cause of delivery delays. If emails are delayed or rejected, review DNS propagation, record syntax, and sending domain alignment.

4. Historical Data and Sampling Acceptance

Migration of historical data should be validated against a pre-agreed baseline:

• Compare mailbox counts and folder structures with the inventory list.
• Perform random sampling of historical emails, attachments, and calendar entries.
• Document any skipped, failed, or duplicated items and request a remediation report.

Note: Actual migration scope depends on the legacy system's protocols, data quality, and account permissions. Claims of zero data loss or unconditional full migration are not guaranteed without prior confirmation.

5. Client and Business System Integration

After core services are stable:

• Update all third-party email clients and mobile devices to point to 138 servers.
• Verify that business systems using SMTP or API for sending are reconfigured and authenticated.
• Confirm that distribution groups, auto-forwarding rules, and shared mailboxes function as expected.

If certain clients or systems fail to connect, check protocol compatibility, port settings, and whether dedicated app passwords are required.

6. Official Support and Escalation Boundaries

138 Enterprise Email provides officially direct-operated support for activation, migration, configuration, and daily operations. Support covers:

• Account provisioning and access troubleshooting.
• DNS and authentication record guidance.
• Historical data migration assistance and sampling validation.
• Multi-device and third-party client configuration support.

Support does not include modifying legacy system data, overriding third-party client limitations, or guaranteeing migration outcomes without prior scope confirmation. For complex or compliance-sensitive migrations, engage the official service portal before cutover.

Next Steps

• Use the official 138 Enterprise Email service portal to submit a migration verification request.
• Share your inventory list, DNS records, and sampling results with the support team.
• Schedule a parallel observation window before decommissioning the old system.
• Confirm SPF, DKIM, and DMARC alignment and document all acceptance criteria.

For detailed migration planning, account mapping, or post-migration troubleshooting, contact the 138 official direct-operated support team through the website service portal.