All:
I am looking for a way to modify an email message in transit. In all cases I will be modifying the "to", "from", and some other headers. In some cases - I will be removing a string from the body of the message. In other cases - I will be adding a string to the body of the message.

I have been using Mail::Audit (which uses MIME::Entity if needed) as a starting point, and am going to throw some snippets to give you an idea (in no particular order): 

my $mail = Mail::Audit->new(data => \@message);

$mail->bodyhandle;
my @body = $mail->bodyhandle->as_lines;
if ($msgtyp ne 'reply') {
    my $orig_from = $mail->get('Reply-To') ? $mail->get('Reply-To') : 
+$mail->get('From');
    unshift @body , "RPLYFROM: $replyfrom";
    unshift @body , "ORIGFROM: $origfrom";
    if (my $io = $mail->open("w")) {
        $io->print($_) foreach(@body);
        $io->close;
    }
}

$mail->delete_header('Reply-To') if ($mail->delete_header('Reply-To'))
+;
$mail->delete_header('Received'); 
$mail->delete_header('Message-Id'); 
$mail->replace_header('From', $orig);
$mail->replace_header('To', $recip);

$mail->resend($recip);

[download]

Ok - you get the idea - I munge the data, so what's the problem? I am not sure how to handle MIME body correctly. What I would like to say is:

  • Remove string x from the body and have it figure out how to handle the plain text and/or MIME
  • Add string x to the body and have it figure out how to handle the plain text and/or MIME

    I thought I was pretty close until I encountered "Content-Type: multipart/alternative;". There are basically multiple pieces to the body (in my case plain text and HTML). The email client chooses the one it likes.

  • Now I am parsing HTML which I hadn't counted on (another module)
  • I have no idea how to make sure both pieces are updated so that it doesn't matter which body the client chooses.

    I am grateful for any help that I can get, but what is most desireable is a working template. I can handle modifying all the headers - it is the body and specifically MIME body that is causing me grief.

    Thanks in advance - L~R

    In reply to Advice for email munging by Limbic~Region

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