20 years of running the classic postfix + dovecot stack for about 10 business domains. I’ve recently been testing out stalwart, with just one company domain, which is nice but seems quite fragile, 4 times now it’s killed itself doing some self updates. If it wasn’t for Claude assistance I probably would have given up on it by now. It is quite feature rich though, but its spam detection is not great, too much ham flagged as spam, not enough spam flagged as spam. 2FA is a nice bonus but for some unknown reason it breaks itself every few weeks and I gotta turn it back off again. If I could get stalwart stable I would migrate all my domains to it.

Why switch then? Need more excitement in your life?

I have been running Postfix for 22 years, from a big corporate installation to my own on a Raspberry Pi Zero. It just does its job.