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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.

Thanks.

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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 127.0.0.1. Should I removed the 127 address?
    – The Woo
    Sep 6, 2009 at 23:26
  • 127.0.0.1 is localhost. There's no need to remove it.
    – Cian
    Sep 6, 2009 at 23:33
  • Neither ip address needs to be in the list, so remove them both.
    – joeqwerty
    Sep 7, 2009 at 0:00
  • What about all this crap from MS? technet.microsoft.com/en-us/kb/kb00324958.aspx
    – The Woo
    Sep 7, 2009 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, 2009 at 0:12

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