Welcome to Matts Admin tips. This blog is full of little fixes, tutorials and work-arounds to those anoying problems that a Systems Administrator might face. If you find something that you have found useful please leave me a comment - I appreciate knowing that I've helped! Also, feel free to leave a comment if my tips or ideas don't work in your environment... I monitor them closely and would be happy to help! Matt

Locking down outbound SMTP

Posted July 30th, 2008 by Matt Shadbolt

I’ve recently had issues with my companies IP address being blacklisted by a bunch of RBL’s (Realtime Block Lists) blocking mail delivery from our server on the basis that we are sending SPAM. We of course didn’t realize there was a rouge client on our network sending bulk unsolicited emails.
After weeding out the client – [...]

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