Powermta Configuration Guide Top Jun 2026

: A VPS or dedicated server with at least 2GB of RAM (8GB recommended for high volume). Operating System : Current guides recommend Ubuntu 20.04+ or CentOS 8+.

SPF is configured entirely in DNS, not the MTA. Add a TXT record to your domain specifying which IPs can send mail:

Proper DNS and authentication are mandatory for inboxing in 2026. powermta configuration guide top

Before going live:

Enable require-rdns yes on the listener (incoming) to reject connections from IPs without reverse DNS. : A VPS or dedicated server with at

net.ipv4.ip_local_port_range = 1024 65535 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_fin_timeout = 30 net.core.somaxconn = 1024 net.core.netdev_max_backlog = 5000

Example:

Publish the public key in DNS at: default._domainkey.yourdomain.com with the public key content from /etc/pmta/dkim/public.key .