I finally built my own mail server because if something broke my alerts would sometimes hit the maximum limit for a non-business gmail account and not get delivered.
I learned a lot, but it is a pain in this day and age. I had to set up SPF and DMARC records to get it to deliver to gmail. I guess the next adventure is DKIM.
Unfortunately I'm using Citadel, which doesn't have a lot of awesome documentation.
Guess I get to learn some more.