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I have setup exim as a relay server running on nonstandard port. But now spammers have abused it as a relay server for them. How do I prevent this from happening? Can I still have my server as a relay server but prevent spammers to abuse it at the same time?

Thanks for your help.

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up vote 1 down vote accepted

I'd recommend requiring authentication. This document and this wiki entry on authentication should help (I've never used Exim so I can't help with the detail I'm afraid).

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