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Ensure your DNS contains valid SPF records matching your smtp-source-ip . Your DKIM keys must be properly mapped in the configuration file, and a restrictive DMARC policy ( p=quarantine or p=reject ) should be published.
If you are looking to get the most out of your PowerMTA, I can help you with a few more things: for specific domains. Troubleshooting SMTP errors in the PMTA log.
This configuration is ideal for high-volume automated systems that need to bypass the overhead of a full SMTP session. Sample Configuration for a Pickup Directory (Hot Folder) To enable a pickup directory, you must define a block in your main file (typically located at /etc/pmta/config on Linux). Time4Servers
# Authentication: Enable DKIM signing for all domains (if a key is set) dkim-sign yes sample powermta configuration file hot
# ================================================== # PowerMTA Configuration File # ================================================== # Sample PowerMTA configuration file showcasing # high-performance and deliverability-focused settings.
Microsoft frequently issues 421 and 452 transient errors when limits are reached. Your configuration must safely catch these errors, slow down transmission, and retry later without burning IP reputation. PowerMTA Configuration Sample ( config )
The production-ready configuration template and detailed guide below explain how to optimize PowerMTA for hotmail.com, outlook.com, live.com, and msn.com. Understanding Microsoft’s Inbound SMTP Rules Ensure your DNS contains valid SPF records matching
Sample PowerMTA Configuration File: Optimized for High-Volume ("Hot") Delivery
# Authentication settings auth_type = "auth_file" auth_file = "/etc/powermta/auth_file"
# Access log for engagement tracking <acct-file /var/log/pmta/access.log> acct-format "%d\t%t\t%p\t%s\t%vmta%\t%env-sender%\t%rcpt%\t%status%\t%size%\t%msgid%" acct-file-rollback-size 2G acct-file-rollback-time 86400 </acct-file> Troubleshooting SMTP errors in the PMTA log
To help refine this template for your specific environment, let me know:
# Listens on all available IPs on port 25 smtp-listener 0/0:25 # Optional: Listens on port 587 for authenticated users smtp-listener 0/0:587 Use code with caution. Copied to clipboard 3. Virtual MTAs (VMTAs) and IP Pooling
<domain *> dkim-sign yes dkim-identity @mydomain.com dkim-private-key-file /etc/pmta/keys/mykey.pem spf-envelope-from mydomain.com </domain>