Maintaining Allowlists and Blocklists in 138 Enterprise Email: A Practical Guide for Cross-Regional Teams

Maintaining Allowlists and Blocklists in 138 Enterprise Email: A Practical Guide for Cross-Regional Teams

Who Should Use This Guide

This guide is designed for IT administrators and business teams using 138 Enterprise Email services, particularly those managing cross-regional operations like foreign trade teams, manufacturing organizations, and international service providers. Based on verified implementation cases including high-tech manufacturers and cross-border businesses, this addresses real-world email security management scenarios.

Understanding Allowlist and Blocklist Fundamentals

Allowlists (whitelists) and blocklists (blacklists) are essential email security features that control which senders can reach your organization's inboxes. For enterprises with global operations, proper configuration ensures legitimate business communications from international partners are delivered while blocking unwanted messages.

Step 1: Accessing Management Controls

Log into your 138 Enterprise Email administrator portal using your credentials. Navigate to the security management section where you can configure domain-level and address-level filtering rules. The system supports hierarchical administration, allowing different permission levels based on organizational roles.

Step 2: Configuring Allowlists for Trusted Partners

Add domains or specific email addresses from your trusted business partners to ensure critical communications are never blocked. For cross-regional operations, consider:

• Key supplier domains from different geographical regions
• International client domains
• Internal team addresses across global offices
• Service provider domains critical to your operations

Step 3: Setting Up Blocklists for Security Protection

Block known threat sources, spam domains, or unauthorized senders. The system supports:

• Domain-level blocking for entire organizations
• Specific email address blocking
• Pattern-based blocking for suspicious sender characteristics

Step 4: Regular Maintenance Procedures

Perform these checks monthly or quarterly:

1. Review Allowlist Effectiveness: Verify that legitimate emails from allowlisted senders are being delivered properly, particularly from international partners
2. Update Blocklist Entries: Remove outdated entries and add new threat sources based on recent spam patterns
3. Test Cross-Regional Delivery: Verify email delivery to/from different geographical regions where you operate
4. Audit Security Logs: Review logs for false positives/negatives and adjust lists accordingly

Step 5: Troubleshooting Common Issues

Emails from Allowlisted Senders Still Blocked

Verify that the sender's authentication records (SPF, DKIM, DMARC) are properly configured. 138 Enterprise Email supports these authentication mechanisms, but misconfiguration at the sender's end can still cause delivery issues.

Legitimate Emails Going to Spam

Check if the sender's IP reputation has changed. Even allowlisted senders might experience delivery issues if their infrastructure is compromised or blacklisted.

Regional Delivery Problems

For cross-border teams, ensure your allowlist/blocklist settings accommodate different regional email practices. Some regions may have unique email infrastructure characteristics that affect delivery.

Implementation Considerations and Boundaries

• Configuration changes may take up to 1 hour to propagate across all servers in the global infrastructure
• Regional internet policies and regulations may affect email delivery regardless of list settings
• Administrator privileges are required for most configuration changes
• Historical email data is not retroactively affected by list changes

Next Steps for Optimal Configuration

For enterprises with complex international requirements, we recommend:

1. Documenting your current allowlist/blocklist policies and review schedule
2. Establishing a regular testing protocol for key international partners
3. Maintaining an updated list of critical business domains requiring allowlisting
4. Consulting with 138's official support for specific regional configuration guidance

Official Support Access

For persistent issues or complex scenarios involving multiple regions, contact 138's direct-operated support team through the official service portal. Provide specific details about:

• The domains/addresses experiencing delivery issues
• Error messages or bounce notifications received
• Geographical regions affected
• Timeframes when issues occurred

The system supports multi-device access through web, mobile, and PC clients, ensuring administrators can manage security settings from anywhere, which is particularly valuable for organizations with distributed teams across different regions.