POP3/SMTP external authentication error "550 5.7.1 Unable to Relay"
From: Brian (anonymous_at_discussions.microsoft.com)
Date: 03/05/04
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Date: Fri, 5 Mar 2004 06:26:07 -0800
Hello all,
I am having some problems here trying to allow a client to access and send mail from an outside source via pop3 connection. I have a Windows 2000 Server with SP4 and Exchange Server 2003. I have all of the default settings in place. In addition, I have an SMTP connector in place with the default reccommended settings.
My default settings for the SMTP virtual server include the following:
Authentication = Anonymous, Basic, Integrated Windows Authentication.
Relay = Only the list below (with a blank panel), Allow all computers which successfully authenticate....
I have the client set up in Outlook with the following settings:
Internet E-Mail Settings = My outgoing server (SMTP) requires authentication, Log on to incoming mail server before sending mail
I have also referenced the following:
323669.KB.EN-US XFOR: "550 5.7.1 Unable to Relay" Error Message When E-mail
Is Sent to
http://support.microsoft.com/default.aspx?scid=KB;EN-US;323669
(Deals with Exch 2000)
289553.KB.EN-US XIMS: Non-Delivery Report 550 5.7.1: Unable to Relay
http://support.microsoft.com/default.aspx?scid=KB;EN-US;289553
(Deals with recipient policies - this appears to be inbound mail)
283287.KB.EN-US XADM: Users Receive Random 5.7.1 and 5.7.3 NDRs
http://support.microsoft.com/default.aspx?scid=KB;EN-US;283287 (also
Exch 2000 and corrected in SP1)
327759.KB.EN-US HOW TO: Use Recipient Policies to Resolve Nondelivery
Reports Caused by
http://support.microsoft.com/default.aspx?scid=KB;EN-US;327759
Bottom line is, with logging enabled, I can authenticate successfully with pop3 first, then I get denied by the SMTP virtual server. Everything I have read says that it is set up correctly (I think). Here is a shot of the two logs:
First,
Event 1010; Source POP3SVC
Client *.*.*.* successfully logged on to mailbox *******@*******.net
Followed by:
Event 7010; Source MSExchange Transport
This is an SMTP protocol log for virtual server ID 1, connection #3. The client at "*.*.*.*" sent a "rcpt" command, and the SMTP server responded with "550 5.7.1 Unable to relay for *********@************.net ". The full command sent was "rcpt TO: <**********@************.net>". This will probably cause the connection to fail.
One last thing, if I force the clients IP into the relay list, everything works fine. The problem is that he has a dynamic IP.
Any help would be greatly appreciated! Thanks in advance!
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