|To enable RBL blocking, as root, run the following:|
The RBLs will connect out to remote servers for each email, check to see if the sending IP is a spammer, and prevent that email from arriving. These lists are regularly updated, so they are highly effective.
Note that some lists also block entire ISP IP ranges, so if your clients are not able to send email, then can switch to sending email through port 587 instead of port 25.
or to disable RBLs, you can do the followig:
|How to enable SpamAssassin on your server.|
|Get exim to listen on another port on top of port 25|
|Setting up Outlook to send through SMTP on port 587|
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