i've hosted my own e-mail for over 10 years and provide imap hosting to my customers. my main reason for doing it is having control over my own data, backups,

i've hosted my own e-mail for over 10 years and provide imap hosting to my customers. my main reason for doing it is having control over my own data, backups, and logs. my customers use it because they don't need an exchange server (my servers do caldav for calendar sharing) and don't trust google. i do complex server-side filtering with procmail to keep my inbox clean (so all of my devices polling my mailbox will only alert me when something important comes through), automatically archive all email in an "allmail" backup folder, and do things like rewrite e-mail headers for certain conditions.