I run my own, but from time to time large blocks of IP space on Digital Ocean seems to get put into some blacklist. My solution was to use a fallback delivery t

I run my own, but from time to time large blocks of IP space on Digital Ocean seems to get put into some blacklist. My solution was to use a fallback delivery through SendGrid and their free tier (happens rare enough, and my volume is low). Postfix handles this nicely for me.