my server getting email bombs, HELP!!!

[Chris W. Parker]

kfliong <mailto:kfliong at WOFS.COM>
    on Sunday, September 26, 2004 11:52 PM said:

> all are undelivered mails send back to us but in the first place, we
> did not sent them out. Someone is masking as our domain and sending
> out spams. Cause the mails that get delivered back is sent to email
> accounts that does not exist. Mailscanner is able to filter them but
> not fast enough as the mails comes in splitseconds.
> 
> Anyway I can filter this at MTA level? Or can i set sendmail to reject
> mails that have "blank" from field?

i use sendmail and block all email that is not sent to a known user.
some information can be found in the MAQ. i should say that i don't do
it the way the MAQ describes, but in a way that needs to be updated by
hand (as opposed to automatically via script).

http://www.mailscanner.biz/maq/#whatifijust


chris.

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