Billion-Mail V2.2

BillionMail v2.2 Release Notes

🔒 Security Fixes

Protection System

• Fixed fail2ban rule misconfiguration issues
• Resolved DKIM duplicated sign-headers bug
• Patched security risk of source IP exposure in email headers

Data Encryption

• Fixed password encryption failure after mailbox information updates
• Enabled 2048-bit DKIM signing by default (anti-spoofing enhancement)

📨 Mail Protocol Optimization

Certificate Automation

• Auto-apply SSL certificates upon sender domain creation
• Added certificate auto-renewal mechanism

Anti-Spam Detection

• Optimized SPF/DKIM/DMARC records verification logic

Relay Service Adjustment

• Removed smtp_header_checks for SMTP relays

⚙️ System Stability

Core Services

• Fixed critical concurrent map-write crash vulnerability
• Improved timezone configuration workflow (Note: CLI-only for now)

Mail Routing

• Refactored Message-ID generation algorithm (collision prevention)
• Server IP now returned in common configuration interfaces

🛠️ Operational Tools

bm.sh Script Enhancements

• Added clear command (legacy image cleanup)

Localization

• Replaced YouTube with Bilibili links in README-zh_CN.md