You Guy's cannot imagine how happy i am that administration is a lost "art", i have 23 mail-servers for customers (different "clouds" from A to V plus some Colo-Servers) mostly the same setup (*BSD,rspamd,opensmtp,dovecot, blablabla), none of those mails get rejected or marked as spam by any of the "big" ones.

The secret sauce? I will not tell you ;)