nomad

My stack is postfix, dovecot, slapd for accounts, SoGO for web mail, calendar and task and contact management. Syncs to my phone via davx and just works out of the box. It’s multi domain and my small company even sells hosted email services.

Rspamd for anti spam and dkim. Use a free email testing service to confirm SPF etc are setup correctly.

Also make sure you have regular backups and up to date lets encrypt certificates.

Lots of good answers here, mostly consense is that everybody deserves a decent burial. In my opinion this is correct, but because it’s about respecting live itself. They might not have made anything good out of it, but respecting life in any form should be the thing we as a society do.