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The Ultimate PowerMTA Configuration Guide: Top Tips and Tricks

virtualMTA vmta_us smtp-source-ip 203.0.113.10 max-msg-rate 300 max-msgs-per-conn 20 end virtualMTA powermta configuration guide top

Example: The "Strict" Microsoft (Outlook/Hotmail) Block

<domain outlook.com>
    max-smtp-out 10          # Lower than Gmail.
    max-msg-rate 5/s
    max-msg-per-connection 20
    use-starttls always
    # Microsoft penalizes rapid retries
    initial-pts 300          # 5 minutes on first temp fail.
    max-pts 7200             # 2 hours max penalty.
    # Honor their Junk Mail Reporting
    honor-dmarc-results true
</domain>

file. Replace default IP addresses with your server's actual IP and update all domain instances to match your sending domain. Authentication The Ultimate PowerMTA Configuration Guide: Top Tips and

Before touching the configuration file, ensure your infrastructure is ready: Server Specs powermta configuration guide top