the whole greylisting, spam filtering thing

Hi there,

my boss is getting on my nerves that greylisting is basically out of
date because of things like outlook.com and mails ending up delayed for
ever. So the next logical step would be to deploy a tool like rspamd or
spamassasin to examin mail content. These tools need to be trained and
if you have a small mailserver with less accounts this could take a
while I imagine.

So my question is, is there some source that you could use to train
these kind of tools (like a database that you could connect to for
training conntent ) or is every one here, that uses these tools, lucky
enough to have a shit load of users that do the training for your systems?

some informations about this would be helpful

regards

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