Oh the other thing (in case anyone’s interested), is I tested disabling the greylist since I saw alot of posts about it. You can disable it by putting a “return ‘DUNNO’;” statement on line 337 of /usr/sbin/postgrey … Like in this example
But I ended up just reducing the greylist TTL from 300 seconds to 180 seconds instead; seems like a less hack-y solution.