get SMTP at port 25 to work again with ISP IPTABLES forwarding / WIP

levelsio

get SMTP at port 25 to work again with ISP IPTABLES forwarding on pieter.net to mail.pieter.com at port 587 because Eudora only support 25 but Hetzner won't let that through

The image displays a terminal interface showing configuration details for SMTP and IPTABLES settings.

The image displays a terminal interface showing a successful configuration of iptables for SMTP traffic redirection.

A Telnet session is displayed, showing SMTP communication with a mail server.

The image displays the Eudora Light email client interface showing a progress window for sending an email.

14:58 · 06/12/2025 UTC