AmigaCity offers a free email service for Amiga users who might need to use a email client that doesn't support SSL/TLS. Those are offered but not required.
The URL is
https://AmigaMail.xyz and once you create your account there you can add it to your email client of choice.
Not sure why, but there seemed to be some kind of attempt to either disrupt the service or possible someone was sending a big file but the server kept filling up 100% disk usage every day. Rather than keep restoring it I did a fresh install of Ubuntu and Citadel and doubled the cores and RAM, and added 30gb of SSD above what was on the old server. Let's hope that addresses the issue. And if you do see issues please let me know!