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We are trying to get MessageLabs service up and running. We have been asked to make sure that we do not allow Open-Relay so that the traffice is minimised for them.

How do I do this? Windows Server 2003 with Exchange 2003.


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up vote 3 down vote accepted

You go into ESM, go to Administrative Groups -> -> Protocals -> SMTP. Then right click on select properties, go to the Access tab, Click the relay button then Make sure it is set to "only the list below" Make sure your computers/subnets that your trust are in the box below. You should be good at that point.

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So in that section is the exchange IP Address, as well as Should I removed the 127 address? – The Woo Sep 6 '09 at 23:26 is localhost. There's no need to remove it. – Cian Sep 6 '09 at 23:33
Neither ip address needs to be in the list, so remove them both. – joeqwerty Sep 7 '09 at 0:00
What about all this crap from MS? – The Woo Sep 7 '09 at 0:00
Well that article is for SBS in a very specific scenario. I can tell you from years of administering Exchange that by default, the list does not need to be populated in order for Exchange users to send email. – joeqwerty Sep 7 '09 at 0:12

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