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Thanks for the links. Which RBL checks to be used is unimportant for me. It's only important that we reach the goal and stop the spam :) I will try to configure the SpamAssassin as described in the wiki. Is there a log or anything where we could see if the mail is being checked by SpamAssassin? I'm ...

That doesn't sound good. Due to legislation and agreements, we have to use the relay server of the external service provider, which does not seem to use a good spamfilter. Is there really no other way to achieve a good filtering?

Hey there, I have a question about the RBL checking. Our incoming mails are forwarded by an external mailserver to efa server and then being forwarded to our exchange server. In this constellation the sender is always the external mailserver of course. If I understand this correctly, only the last s...