From: Rene Bartsch (no email)
Date: Sun Feb 01 2004 - 06:00:47 EST
Hi,
first I'm new to the list, so Hello to all :-)
As I haven't found a developer's list, I'm posting to this list. If there is
one, please point me to.
Now my idea:
If a spammer sends a mail, it is processed by postfix, goes through
filter-chains like amavisd-new with SpamAssassin and F-Prot and is
distributed to IMAP-folder by e.g. procmail.
But that way the Spammer has success or believed success as he can deliver his
spam to the MTA. The sender of a wanted mail may be deceived when the
spam-filter drops a mail. Sending a error-mail cannot be done, too, as
address-spoofing would result in a DoS-Attack to the stolen address. So the
only way is to disconnect the SMTP-connection with error.
If Postfix would keep the SMTP-connection until the mail has passed the filter
chains, it would be possible to disconnect the SMTP-connection with a OK in
case the mail is fine or with a failure in case the mail is malicious and
dropped by one of the filters.
So a friendly mailer would get a error-report if his mail has been
mis-detected and a spammer would get an error-report making him aware this
address is useless for him.
Comments?
Rene
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