[AMaViS-user] Re: Amavis and disclaimers

> I mailed you about a week ago about modifying amavis to append
> disclaimers to mails. I finally came around to fiddeling with
> the subject and added the following code at around line 6680
> in amavisd version 2.2.1 (right after the if( defined $explanation )
> block:
>
> $msginfo->mime_entity->sign(
> File => '/etc/resolv.conf',
> Remove => 0
> );

You still need to replace the $msginfo->mail_text

Normally the $msginfo->mail_text is a file handle of an
opened file email.txt. The forwarding code takes whatever
is in a $msginfo->mail_text (a file handle or a MIME::Entity object)
and sends it.

Here is how 'defanging' code replaces a file by a newly-constructed
MIME::Entity object:

do_log(1, "DEFANGING MAIL: $s");
my($d) = defanged_mime_entity($conn,$msginfo,$explanation);
$msginfo->mail_text($d); # substitute mail with rewritten version
$msginfo->mail_text_fn(undef); # remove filename information

There is one fundamental caveat with your approach of modifying
existing MIME::Entity object: the original body stored on an external
file in a parts subdirectory) may have been removed by now during
the process of recursive mail decoding. You approach may work
if decoding is entirely disabled, or if you set
@keep_decoded_original_maps=(1);
although I never tried it.

Alternative approach is to prepare a new mail file from existing email.txt,
close the $msginfo->mail_text descriptor, discard the old email.txt file
and reopen $msginfo->mail_text on a new file.

> Btw, once I have this cleanly implemented, do you want a patch of this?

A general purpose solution requires substantially more work,
it should be able to rebuild the MIME::Entity object from
approved parts, similar to what mimedefang does. I'm not much
interested in a partial solution.

Mark


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