Jason,
> I am interested in creating a plugin that works with Amavis.
>
> The purpose of the plugin is to replace a large email attachment with a link
> to the file that was originally attached- that way the messages won't be
> bounced from larger providers who support smaller email messages (10MB).
> I realize sending such messages through email is very inefficient, but
> unfortunately many users don't understand this concept.
>
> I would like to know the injection point where I can "plug in" to Amavis?
> If possible, I would like to run my code after all the other rules have run.
>
> Any further information would be very much appreciated!
One possibility would be to hook an external program to do the transformation
on a mail file through the altermime defanging mechanism, and provide a
replacement file, which will then be adopded by amavisd and fed to a MTA.
Another possibility is using a custom hook 'before_send' and let it prepare
a modified complete message on an alternate file, open it, and let amavisd
know about the substitute, something like this (untested):
my $old_fh = $msginfo->mail_text;
my $old_file_name = $msginfo->mail_text_fn
my $new_fh = IO::File->new;
$new_fh->open($new_file_name,'<')
or die "Can't open file $new_file_name: $!";
binmode($new_fh,":bytes")
or die "Can't cancel :utf8 mode: $!";
$msginfo->mail_text($new_fh);
$msginfo->mail_text_fn($new_file_name);
$old_fh->close
or die "Can't close old file: $!";
unlink($old_file_name)
or die "Can't delete old file $old_file_name: $!";
or alternatively, just modify the existing open temporary file
in-place, keeping its name and filehandle.
Mark
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