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503 Error, No Recipient

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503 Error, No Recipient [message #468780] Mon, 12 January 2009 14:40 Go to next message
Messages: 2
Registered: January 2009
Junior Member
I'm the IT Guy for a small company with about 50 computers. One computer
is having Outlook Problems. The user can receive emails fine, but is
unable to send, getting the message 503, No Recipient, even though it's
a valid address. I've tried doing several things to fix, but haven't
been successful.

Here's what I tried in various combinations.

-Set the Outgoing Server to Require Authentication while using the same
settings as the incoming mail server
-Changed the Outgoing Server from 25 to 465
-Cleared internet settings and reset web/sercurity settings back to

I enabled and viewed the OPMLog and here is what I received for

2009.01.12 11:10:12 SMTP ( <rx> 550-Verification
failed for <*****>
2009.01.12 11:10:12 SMTP ( <rx> 550- Unroutable
2009.01.12 11:10:12 SMTP ( <rx> 550 Sender verify
2009.01.12 11:10:12 SMTP ( [tx] DATA
2009.01.12 11:10:12 SMTP ( <rx> 503 No recipient(s).
2009.01.12 11:10:12 SMTP ( End execution

I appreciate any additional suggestions to correct! Outlook 2003, SP3,
with XP

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