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Mail bounces with #5.1.2 reply when sending from Outlook 2007, but not from OWA, sending to specific addreses, not all?

Posted on 2010-11-15
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Last Modified: 2013-11-30
Hi, I have a user that gets bounces when he sends mail to a few (far from all) recipients from his Outlook 2007 client, but not from Outlook Web Access, connected to the same Exchange server 2003 (SBS). If the recipient is in his contacts the bounce doesnt give any information more than "unable to deliver". If the user deletes the recipient from contacts,  the bounce reply with the <mail.xx.com #5.1.2>.
We have set up his user on another computer and the same thing happens.
Anyone got an idea what the problem is with the Outlook client?
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Question by:Mistlur
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Expert Comment

by:ob1_
ID: 34136579
I would re-create the Outlook profile on the user's PC just to be sure and make sure you are typing the address in correctly and not selecting it from contacts or using Outlook auto-fill to fill it in.

SMTP Error 512 :
This SMTP reply code is received
when one of the servers on the way to the destination is
unable to resolve the domain name of a recipient email
address. Said differently : one of the servers on the way
to the destination, including your server or your ISP, has a
DNS problem or, possibly correctly, does not like one of
the email addresses in the message’s TO, CC, and BCC
fields.
The first check you should perform to resolve a 5.1.2 reply
code is to check all the recipient email addresses for
incorrect domain names (misspelt domain names, or,
maybe, totally non-existent domain names) – remember,
error code 512 is very specifically an error with the
domain name of one of the recipient email addresses.
You can call the recipient(s) or use the WHOIS tool of The
Ultimate Troubleshooter. If all the recipient email
addresses check out as regards the domain part of the
email addresses, then one of the servers on the way to the
recipient(s) has DNS problems – usually this will be one of
the first 2 servers in the chain, your own mail server (or
your network) or your ISP’s mail server.
Examples of typical SMTP error 512 messages : “5.1.2 -
Bad destination host 'DNS Hard Error looking up domain”,
or “SMTP Error 550 5.1.2 Host unknown – host cannot be
found”, or how about this fantastically informative error
message “5.1.2 The message could not be delivered
because the recipient's destination email system is
unknown or invalid. Please check the address and try
again, or contact your system administrator to verify
connectivity to the email system of the recipient.”.
--------------
In summary : most SMTP error 512 conditions are
caused by misspellings of the domain name part of a
recipient email address. However, with the proliferation
of spam, error 512 is also often encountered by automatic
“out-of-office” replies to junk mail because the domain
names used by junk mail are often bogus domain names.
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Author Comment

by:Mistlur
ID: 34136721
Hi, as I mentioned we have already set up his Outlook profile on another computer, with the same result, so re-creating the profile on his computer (which we also have done), will not solve the problem.
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Accepted Solution

by:
Mistlur earned 0 total points
ID: 34309827
I tested to delete every item in one contact that was bouncing and sent yet another bounce, but when I came to the last item (or the first), the mailaddress, deleted it, saved the contact and typed it in again, the mail was sent without any problem...:-)
So something mysterious was lying in the mailaddress!
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Author Closing Comment

by:Mistlur
ID: 34341534
-I worked my way to the solution myself.
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