Using outgoing esps (email service providers) and self hosting the rest trivializes this.

Or you can just run something like mdaemon and let it trivialize self hosting mail.

Self hosting is the original devops

IP reputation matters. If you self host, for the love of god don't use DO/AWS/Linode/etc. Small, established hosts are best, in my experience - shoutout to Mythic Beasts and (in times gone by) Bytemark for that.

Using outgoing esps (email service providers) and self hosting the rest trivializes this.

Or you can just run something like mdaemon and let it trivialize self hosting mail.