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Subject: RE: header_checks
From: Franck Martin (Francksopac.org)
Date: Sun Oct 22 2000 - 18:16:47 CDT

Wietse,

It seems that in pl08 the content filtering is done by body_checks which
behave like header_checks. It would be easier if both use the same syntax in
the filter file...

Could you ensure that you have an ERROR that enhance the REJECT by giving a
reason of the REJECT during the session depending of the regexp.

Are there any other content filtering hooks that I'm not aware despite
body_checks.

Cheers.

Franck Martin
Database Development Officer
SOPAC South Pacific Applied Geoscience Commission
Fiji
E-mail: francksopac.org <mailto:francksopac.org>
Web site: http://www.sopac.org/ <http://www.sopac.org/>

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-----Original Message-----
From: wietseporcupine.org [mailto:wietseporcupine.org]
Sent: Monday, October 23, 2000 2:47 AM
To: postfix-userspostfix.org
Subject: Re: header_checks

Kevin Cosgrove:
>
> fm> I think I understand the purpose of DROP, but usually the parsing is
done on
> fm> the fly as fast as the e-mail is getting sent. That's how it works for
> fm> body_checks at least. It means that after the client issue DATA, the
parser
> fm> check each line and if there is a REJECT then the server sent straight
away
> fm> a 552 error stopping further data being sent...
>
> Doesn't REJECT also send an error message back to the sender?
> I think I'm seeing bounced email from these error messages.

A REJECT match in the header checks causes the Postfix SMTP SERVER
to reject the mail. In other words, Postfix does NOT receive the
mail, nor does Postfix send a message to the sender.

If is up to the mail CLIENT software to inform the sender of the
problem.

> fm> About error, I'm not thinking about SPAM only, but say offensive
e-mail, or
> fm> rejecting certain type of attachments (like VBS files). It is good
then to
> fm> explain that we don't like this e-mail and we would like to see it
worded
> fm> differently.
>
> I completely agree about and ERROR action.

Mail attachments are not handled by the header checks. For content
filtering, use the Postfix content filtering hooks.

        Wietse