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MSExchangeTransport - 7010 unable to relay

Posted on 2008-06-14
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Last Modified: 2008-06-15
Hi
I'm running exchange on an SBS server, and when I look in my event logs I see these messages

This is an SMTP protocol log for virtual server ID 1, connection #92. The client at "190.2.22.85" sent a "rcpt" command, and the SMTP server responded with "550 5.7.1 Unable to relay for some-address ". The full command sent was "rcpt TO:<some- address>". This will probably cause the connection to fail. For more information, click http://www.microsoft.com/contentredirect.asp.

As far as I know my server shouldnt be relaying messages is there a way I can stop this?
Thanks
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Question by:Dan560
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tigermatt earned 2000 total points
ID: 21785978
>>> "As far as I know my server shouldnt be relaying messages is there a way I can stop this?"
That's correct - and the server isn't actually relaying any mail. What is happening is a spammer is trying to use it as a relay, but the moment they are doing that, it is responding with the message "Unable to relay for <some-address>". If it said a message was accepted for transmission - or something to that effect - then I would be worried since you are an open relay potentially sending out spam. But as it stands, you are not anything of the kind.

There are two ways to check if you're an open relay, but based on the information you've provided, I can tell you now that you are not acting as one.

http://www.amset.info/exchange/smtp-openrelay.asp
OR
http://www.abuse.net/relay.html

-tigermatt
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by:Dan560
ID: 21786093
Ok, I did the checks and its not an open relay.. so is there a way to stop spammers attempting to do this? I'm the type of person that likes to keep my event logs free of errors! but if this is isnt possible then it isnt really a problem.
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by:tigermatt
ID: 21786096
If you've got port 25 open to your server - which you must have open for legitimate mail to be received to mailboxes at your domain - then spammers are always going to be able to access Exchange and will always attempt to send mail through your server. Provided it fails everytime, they should give up after a few attempts - but that's not to say there's not another spammer out there who will come along and try.

Unfortunately spammers - who are evil people - are always going to do this. There's nothing you can do about them using your server in this way unfortunately.

-tigermatt
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by:Dan560
ID: 21788782
never mind, thanks for your advice.
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by:tigermatt
ID: 21788793
You're welcome,
:-)
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