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[cobalt-developers] undeliverable mails from john@...



In the last few days I've got tons of mail for "No such user here". This is what I find in the log:

Jan 15 03:44:29 www sendmail[8547]: h0F2iSG08547: <30afL22101E114383f5d@xxxxxxxxxxxxxx>... No such user here
[30 similar entries]
Jan 15 03:44:29 www sendmail[8547]: h0F2iSG08547: <wolf@xxxxxxxxxxxxxx>... No such user here
Jan 15 03:44:32 www sendmail[8547]: h0F2iSG08547: from=<john@xxxxxxxxxx>, size=0, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=[62.2.240.67]
[...]
Jan 15 05:43:35 www sendmail[15286]: h0F4hZG15286: <captain@xxxxxxxxxxxxxx>... No such user here
[30 similar entries]
Jan 15 05:43:36 www sendmail[15286]: h0F4hZG15286: <phi@xxxxxxxxxxxxxx>... No such user here
Jan 15 05:43:39 www sendmail[15286]: h0F4hZG15286: from=<john@xxxxxxxxxxxxxxxx>, size=0, class=0, nrcpts=0, proto=E
SMTP, daemon=MTA, relay=host234-33.pool21757.interbusiness.it [217.57.33.234]

It seems this "john" tries about every 2 hours to reach 30 randomly selected usernames.

Can I do anything about it? Since he uses different servers and username each time I can't block those. could sendmail maybe detect this and suppress the answers?

Jens-Peter