[Mimedefang] Detecting content-type of message in filter_end

[Aleksandar Milivojevic]

Aleksandar Milivojevic wrote:
> I wanted to extend my mimedefang-filter to block disposition 
> notifications (return receipts).
> 
> In short, what I attempted to do in filter_end was the following:
> 
> if (lc($entity->head->get("content-type")) =~
>     m+multipart/report.*disposition-notification+) {
>         md_graphdefang_log('disposition-notification');
>         return action_bounce("Disposition notifications not allowed");
> }

[snip]

I've found workaround that can be used after SpamAssassin check 
(spam_assassin_check()) is done:

$sa_status = spam_assassin_status();
$ct = $sa_status->get("content-type");
$dn = $sa_status->get("disposition-notification-to");
... and so on ...

will fetch correct header info (for all headers).

Using SpamAssassin just to fetch header values would be an overkill, but 
if SpamAssassin is used anyhow, above will work.

Hopefully, the bug in MIMEDefang will be completely resolved soon, so 
that $entity can be used for this...

-- 
Aleksandar Milivojevic <amilivojevic at pbl.ca>    Pollard Banknote Limited
Systems Administrator                           1499 Buffalo Place
Tel: (204) 474-2323 ext 276                     Winnipeg, MB  R3T 1L7