Powermta Configuration Guide !!exclusive!!

<domain example.com> dkim-sign yes dkim-selector mail dkim-key /etc/powermta/keys/example-dkim.key dkim-headers "From:Subject:Date:To" </domain>

: While PMTA has a small footprint, a minimum of 2GB RAM is required, though 8GB is recommended for heavy workloads. powermta configuration guide

No reverse DNS (PTR) or poor IP reputation. Fix: Contact your DC for PTR matching your domain. Use Gmail Postmaster Tools. &lt;domain example

http-mgmt-port 8080 http-mgmt-interface 0.0.0.0 http-mgmt-auth /etc/powermta/htpasswd powermta configuration guide

The <domain> block is where deliverability is won or lost. It allows you to create rules for specific ISPs.