[Mimedefang] stream_by_recipient() and Postfix

Philip Prindeville philipp_subx at redfish-solutions.com
Thu Sep 13 01:15:52 EDT 2012

On 9/12/12 9:17 PM, Philip Prindeville wrote:
> [snip] Then it worked.

> Not thrilled about having 2 Received: lines, but what can you do; I could tweak resend_message_specifying_mode() to not add the synthesized header...

Well, it nearly worked.

I should add that even doing:

sub filter {

    if (lc($type) eq "application/xyzzy") {
        if (@Recipients > 1) {
        } else {
            my $uri = $root_entity->get('X-Xyzzy-URI');
            my $link = Xyzzy::Link->new($uri, $Recipients[0]);
            my $text = $entity->bodyhandle()->as_string();
            my $pkg = Xyzzy::Package->parse($text);

            my $sender = $Sender;
            # defocus
            if (substr($sender, 0, 1) eq '<' && substr($sender, -1) eq '>') {
                $sender = substr($sender, 1, -1);

            # generate an note with a URL and explaining who sent the attachment,
            # what the filename was, what its mime-type was, and its size.
            return action_replace_with_indirect($link->as_string(), $sender, $pkg->name(), $pkg->type(), $pkg->size());


sub filter_end {
    # if we saw attachments, and there was more than one recipient,
    # then we need to split the message into individual deliveries
    # so we can rewrite each one-off.
    if ($sawXyzzyAttachment && stream_by_recipient()) {
        md_syslog('info', "contained xyzzy attachments; resubmitting");
        return action_discard();


this still caused double submission of the email. Once of the unmodified message as a delivery to multiple recipients, and the 2nd delivery individually (at which time it got rewritten as part of the 2nd pass).

This latter detail surprised me, because of:

sub stream_by_recipient() {
    $TerminateAndDiscard = 1;
    return 1;

Why did I need to have an action_discard() to stop the double-delivery right after the stream_by_recipient()?

You'd think that stream_by_recipient() would take care of the original (if there were multiple recipients originally).

What am I missing?


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