problem here is, that the mails seem to come from the web server.
so some1 has a web page on your server, that is insecure and is beeing abused.
perhaps you run a wiki or forum which has a known bug and someone took advantage of it.
shut down your web server and see if this stops the messages...
I have just the same problem here on SLES10 with sendmail and smtp-auth with smtp.1und1.de
and i have the same config as yours:-)
so, im curious, because it took me 3 weeks so far and noone could help me further:
Did you solve this Problem?
Then please tell me how!
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