> the  smtp service of my server stop working without a reason. when i
> send a message the server prompt me for my user and password.

-  Have your logs increased dramatically in size? This could be linked
to a DoS.

-  ODBC  or Registry? As ODBC uses network I/O, a large amount of SMTP
traffic  can  deplete  the number of successful ODBC requests. You can
test  this by creating a dummy Registry domain and testing it when the
other symptom crops up, before restarting.

-  Replaced  the  NIC/patch/switchport?  Any  hard network errors will
exacerbate the above.

-Sandy


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