always-allow-relaying no smtp-service yes process-fbl yes fbl-destination-email fbl@yourdomain.com Use code with caution. 6. Real-Time Monitoring and Web Management Console
smtp-source-ip 192.0.2.10 host-name ://yourdomain.com smtp-source-ip 192.0.2.11 host-name ://yourdomain.com virtual-mta vmta-marketing virtual-mta vmta-marketing-2 Use code with caution.
Are you setting up that require a warm-up schedule?
In modern email delivery, unauthenticated mail is usually junked or rejected. PowerMTA provides native support for signing outgoing messages. Native DKIM Signing
Always configure backoff to notify you. If an ISP throttles you, you need to know about it immediately to investigate content or list hygiene issues. powermta configuration guide top
PowerMTA handles DKIM signing natively. You need to generate a public/private key pair, add the public key to your DNS records, and point PowerMTA to the private key.
This guide provides the —from basic install to advanced virtual MTA tuning. Whether you are a deliverability consultant or a system admin, this is your blueprint.
: Increase the file descriptor limit to handle thousands of concurrent connections. Add * soft nofile 65535 and * hard nofile 65535 to /etc/security/limits.conf . ⚙️ Core Configuration ( /etc/pmta/config ) The main configuration file is located at /etc/pmta/config . 1. General Settings Define who the server is and where it listens for mail. Host Name : host-name mail.yourdomain.com
Create a dedicated listener for bounce/feedback mail: Are you setting up that require a warm-up schedule
DKIM (DomainKeys Identified Mail) is a digital signature standard that helps prevent email spoofing. PowerMTA supports DKIM signing, which allows you to add a digital signature to your emails.
However, installing PowerMTA is only the first step. To maximize inbox placement and throughput, you must configure the config.dat file correctly. This guide covers the you need to master to ensure stability and high deliverability.
PowerMTA excels at processing complaints. You must configure the acct-file to handle bounces and FBL reports automatically.
Use directives to allow specific IP addresses (like your application server) to inject emails without authentication. Native DKIM Signing Always configure backoff to notify you
# No one wants to be a spam bot smtp-service no-bogus-envelope-addresses yes smtp-service no-loop yes
<domain *> bounce-verp-address "bounce+$r@bounces.mydomain.com" bounce-verp-pattern "$r+$h@bounces.mydomain.com" # Critical: Only VERP for hard bounces to save resources bounce-verp-on-hard yes bounce-verp-on-delay no </domain>
However, installing the software is only the first step. A default configuration will rarely yield optimal results. This guide covers the to transform a basic installation into a deliverability powerhouse.
One of PowerMTA’s top features is the ability to create VirtualMTAs. This allows you to partition your traffic.
IP reputation management is essential to prevent spam and abuse. PowerMTA provides a built-in IP reputation management system that allows you to block or allow emails based on sender IP reputation.