Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Postfix.
I use proxmox mail gateway (PMG) for my homelab, configured to relay through my Gmail domain using smtp auth.
I've also used PMG at the enterprise level. Never had an issue with it.
It's postfix underneath.
I run Mailcow-dockerized for my mail server and internal relay, and it's a postfix based system. Never have any issues with it.