This article should help fix it:

290808 - XCON: NDR with Error 0x800CCC79 When You Send SMTP Mail from
Outlook Express:
http://support.microsoft.com/default...en-us%3B290808
--
Jim Pickering, MVP, Outlook Express
https://mvp.support.microsoft.com/pr...8-1171988A62D6
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"hbethke" wrote in message
...
Some of my e-mail to be sent is being rejected by the server under the
Error# 0x8000CCC79, preceded by a 501.
How can I fix this?

Harry.