[oriettaxx]

iredmail (free version) is useless, so expect to pay

I use Ispconfig

they are both ordinary stuff, very very old style

(these all should be in docker swarm nowadays)

Ah, a great modern tool in front of ispconfig is proxmox mail gateway

[nanna]

Free iredmail makes updating extremely labourious. You have to manually update every package to each version step by step. It's a nightmare which is why the paid for version exists. I'm not opposed to paying but beware what you get yourself into.