Paul Murphy wrote:
Tomasz,May 22 15:46:24 statek sendmail[14281]: k4MDkN1J014281: from=<>, size=3019, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=smtp11.wanadoo.fr [193.252.22.31] May 22 15:46:24 statek sendmail[14281]: k4MDkN1J014281: <[EMAIL PROTECTED]>... User unknownLooks like normal activity - someone sending via the Wanadoo server in France is attempting to send you lots of mail for an unknown user, and your system is correctly processing them and returning the user unknown error.
On a side note, this could be backscatter from a forged spam run. It's been a while since I looked into it, but as I recall, Wanadoo either generates bounce notices or does "sender verification" using the ill-conceived method of opening an SMTP transaction and dropping before data.
We see a lot of failed messages from <> to [EMAIL PROTECTED] coming from Wanadoo's servers.
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