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Open relay?

Posted on 2006-10-24
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Last Modified: 2010-03-06
We have been advised by our mail service provider that we are generating a "mail loop". This seems to occur when we receive mail addressed to an unknown e-mail address.

We are also informed that when we receive mail which is sent to an address list, with all of the recipients in the "to" field, Exchange automatically forwards these on to the numerous destination addresses.

Can somone please advise how we can deal with "badmail" so that messages sent to unknown accounts on our domain, are actually dumped into the "badmail" (its currently empty) directory, rather than bouncing it back as an "unkown recipient", and how we ensure that mail received which has a "list" in the "to" field, are not forwarded on.

OK, forgot the basics here, - we have sbs2000 - exchange v5 - sp4
 
Many thanks.
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Question by:nigelbeatson
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Which do you have? SBS 2000 with Exchange 2000 or SBS 4.2 with Exchange 5.5?

Either way, those products are very poor at managing emails for users who are unknown. They accept the email message then attempt to bounce it back on an NDR, which is generally considered to be a bad idea. However as you are using products that are at least seven years old you shouldn't expect them to behave in a way that is acceptable now. The internet is very different to 1999.

If you cannot upgrade then you should look at a third party tool to sit in front of the server that can manage the unknown users and reject them at the point of delivery. Something like GFI Mail Essentials of Vamsoft ORF can both do that.

Simon.
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