I self host my email since 20+ years. Always done with the postfix + dovecot stack with the works (dkim dmark DNS stuff etc).
In the last few years I just removed all spam filters as they where a chore and didn’t provide no much benefit (3-5 spam emails per week) even if my main email address has been out and about for at least 2 decades or more.
Recently, last few weeks, spam is picking up to the point I receive some 10+ spam emails per day and this is pretty annoying, obviously.
So, what are you doing for spam filtering at server level nowadays? Is it still spamassassin circus? Anything better or more efficient?
Are you serving from a homelab or VPS? If a homelab, then you could use pFsense to filter spam. I don’t run my own email server but I do use pFsense to filter 95% of the junk from my inbox. I’m not sure how you’d accomplish that on a VPS other than employing some type of spam filtering software.
How do you block email spam with a firewall?
DNSBL and filter lists. You can use PfBlockerNG to import abuse lists, botnets, known open relays which reduce spam. You can also apply GeoIP blocklists to upstream SMTP hosts.
What? I have opnSense how would I filter spam with it?
https://lemmy.world/post/45508262/23179666
ETA: I know what opnsense is, I have never used it so I am unaware of all of the packages it can run.