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not a valid mailbox - 12.Jul.2006 4:01:52 PM

CASmail

Posts: 1
Joined: 12.Jul.2006
Status: offline

While trying to send an email to a known email address I get this error

The following recipient(s) could not be reached:
'username@domain.com' on 7/10/2006 8:08 AM
The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
<server.domain.local #5.1.1 smtp;550 5.1.1 username@domain.com> is not a valid mailbox

Now I know that the email address is valid because I can send the user an email from yahoo mail.

Our current setup is Windows 2000 server with Exchange 2000

Any suggestions would be greatly appreciated - Thanks

Post #: 1

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RE: not a valid mailbox - 30.Jul.2007 10:10:28 PM

pdowdle

Posts: 14
Joined: 12.Oct.2004
From: Auckland
Status: offline

I would like to know if you got this resolved, cause I have the same problem
If I resend the email it works fine, it just seems to be random

(in reply to CASmail)

Post #: 2

RE: not a valid mailbox - 30.Jul.2007 11:32:36 PM

uemurad

Posts: 5485
Joined: 7.Jan.2004
From: California, USA
Status: offline

Do you have more than one MX record? Perhaps in a load-balancing configuration?

http://exchangeguy.blogspot.com/2007/06/using-nslookup-to-determine-smtp.html

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to pdowdle)

Post #: 3