RE: Problems with relay errors

  • From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 31 Mar 2005 09:44:14 -0800

That notice is from your server rejecting the e-mail, not the recipient
e-mail server. 


Is this from one sender, or multiple senders. Sounds like an authentication
issue on the user's e-mail client.


John T

eServices For You


-----Original Message-----
From: Mike Liddekee [mailto:mliddekee@xxxxxxxxx] 
Sent: Thursday, March 31, 2005 8:36 AM
To: [ExchangeList]
Subject: [exchangelist] Problems with relay errors

I've noticed lately on our mail server (recently updated Exchange 2K
Standard to Exchange 2k3 Enterprise) that we tend to get a lot of
Undeliverable emails when someone internals tries to email an outside party
and comes back with the following:


You do not have permission to send to this recipient.  For assistance,
contact your system administrator.

< #5.7.1 smtp;550 5.7.1 Unable to relay for>



These emails would be usually going to folks that they have corresponded in
the past, sometimes even the same day they've sent emails back and forth.
Eventually (sometimes minutes, other times hours) they can try to resend and
all seems normal.  In each instance, I've been able to manually telnet to
the recipent's mail server and send a test email to the same recipient from
our mail server console no problem.  Any idea what might be causing this?
It's not affecting all outgoing mail, probably just on average of 5-6 a
week.  And its not email going to the same domain each time either.  It's
been all different domains.  Some are large billion-dollar companies.
Others have been small mom/pop shops.  I'm at a loss.



Mike Liddekee
Network Engineer


Humco Holding Group, Inc.
7400 Alumax Dr. 
Texarkana, TX  75501
Ph:  (903) 831-7808 ext 697


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