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They think I'm relaying?

By pbtoms ·
We recently upgraded to Exchange 2003 on a Win 2003 server. Since that upgrade (from 5.5 on Win2k), I've had this happen several times. Not sure if it's a problem on my end, or other people tightening up, or what. I made sure we're not set up to relay, unless authenticated. That all seems fine. But occasionally we get an email bounced back that implies that we're trying to relay. At least, I THINK that's the implication. Example (names have been changed):

somebody@somecompany.com on 9/20/2005 12:42 PM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<MAIL.MyCompany.local #5.5.0 smtp;503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.>

Is this a problem with my mail server, or theirs? The sender was sending from our office, through our mail server. There were several recipients, and only those from this domain were rejected. Any minute now they're going to land in my office asking why they can't email clients, be good if I had a decent explanation of why it isn't my fault. Or find out why it IS my fault, and fix it before they get here...

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by BFilmFan In reply to They think I'm relaying?

If that is the only domain rejecting you, their mail admin has most likely decided you are a spammer.

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by mark_lt In reply to They think I'm relaying?

view the returned path email headers, you will more than likly see that the originating IP was from a different host, and they faked the sent from address.

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by pbtoms In reply to

Sorry, maybe I was unclear. "The sender was sending from our office, through our mail server. There were several recipients, and only those from this domain were rejected." The emails being bounced are ones we sent. I know about the whole spam/virus spoofed thing, we get a lot of those, too. But these are emails our people are sending, that are being returned/rejected by the destination server.

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by tgladney In reply to They think I'm relaying?

Did you ever figure out this problem. I am having the same issues.

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by pbtoms In reply to

Nope. Still seems to happen occasionally. No clue what's going on, as we're certainly not trying to relay through the other mail server, we're trying to DELIVER to the other mail server. *sigh*

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by samthetrue In reply to They think I'm relaying?

did you try asking your email provider if something on there end could be the problem? (as in its not your fault or the recivers fault but the problem might be in the middle?)
this probably wont help much buts its always worth trying...

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by pbtoms In reply to

We ARE the "email provider". It's our Exchange server.

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We've got the exact same problem

by bfoster In reply to They think I'm relaying?

I received this error on an email in which I was replying to all. I got kick backs on all messages sent to one specific domain, but when sending the same message manually (not replying, but sending a new message to addresses in this domain) I do not have any problem.

Is this the same process you are trying to do or are you getting the message on a new email?

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Check Reverse Lookup of your MX record

by jaykulsh In reply to We've got the exact same ...

If reverse lookup of your MX record is ambiguous like resolving to just the domain name and not any host name, this might happen.

Jay Kulsh

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by waelnady1 In reply to Check Reverse Lookup of y ...

any updates yet...

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