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<virtual-mta localhost> # Assign one or more sending IPs to this VMTA. smtp-source-host 203.0.113.1 my.hostname.com # ... additional IPs ... </virtual-mta>
However, out-of-the-box PowerMTA settings are not optimized for modern mailbox providers like Gmail, Outlook, or Yahoo. Achieving a 99% inbox placement rate requires a robust configuration tailored to strict ISP throttles and authentication rules. powermta configuration guide top
This guide assumes you have a valid license and have installed PMTA (typically in /etc/pmta/ ). The main configuration file is config (or config.dat post-compile).
Security: Never run as root.
Set up monitoring and logging to track PowerMTA performance and issues: This public link is valid for 7 days
Configure PowerMTA to accept injection traffic only from trusted local IP addresses or authenticated application servers.
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use-starttls yes require-starttls no ssl-v2 no ssl-v3 no ssl-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256 # Enforce TLS for strict enterprise receivers use-starttls yes require-starttls yes Use code with caution. Can’t copy the link right now
This defines how many total outgoing connections PMTA will make. Start here.
Modern mailbox providers reject unauthenticated mail. Your PowerMTA configuration must enforce SPF, DKIM, and DMARC alignment, alongside TLS encryption. Enabling TLS (Transport Layer Security)
: Implement mandatory email authentication for inbox delivery. : Verify sender authenticity via DNS. : Sign outgoing emails to prevent tampering. : Set policies on how to handle failed authentication. Reverse DNS (rDNS)
PowerMTA is a popular, open-source email server software used by many organizations to manage high-volume email campaigns. Configuring PowerMTA can be a bit complex, but with the right guidance, you can optimize your setup for better deliverability, scalability, and performance. In this post, we'll share the top tips and best practices for configuring PowerMTA.
PowerMTA solves this with . When a specific error string matches your backoff criteria, PowerMTA automatically reduces connection speeds, shrinks the max-smtp-out value, or holds the queue temporarily. Backoff Rule Implementation