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It's really just postfix + rspamd.

rspamd is very, very impressive. I guess most of the hard work I've put into it is adding some of the not-turned-on-by-default things, like Pyzor and Razor. Also adding some other RBLs that weren't included by default (I spent a lot of time personally researching them and only picking ones that I believed to be of high value) The other big thing that I think is important is the RBL whitelists - DNSWL.org and HostKarma have a whitelist as well.

About one a week I spend 10-15 minutes looking at the logs of what it's accepted/rejected during the week to see if I can spot any obvious mistakes - it's pretty rare. If I do spot something I make config changes to address it. That said there's been months before where I haven't done this and none of the users of my platform have complained about spam (or missing email)

rspamd really is that amazing. I don't understand why more people don't scream it's praises from the rooftops.



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