I was able to run my personal mailserver for nearly two years without having to learn what amavis-new was. After that, I started getting enough spam that it became an annoyance and I added it.

Webmail is not that important to me now that I have a smartphone (I really recommend K-9 Mail for Android, which is FOSS https://play.google.com/store/apps/details?id=com.fsck.k9&hl...). Failing that can always log into my machine using ssh and use mutt to read and send mail.

I think the mailserver SQLite is Postfix (SMTP), Dovecot (IMAP) and some DNS records.