Thanks. I passed your suggestions along to the SpamCop webmail admins. 
Hopefully they'll consider the SA rule option, since I know they use SA.

You can probably search for PDFs in the whole message, then. There is 
no particular facility to search for attachments with IMAP search 
commands, and while I'd be happy to hear from Spamcop and work with 
them on if some sort of special-case rule makes sense, my opinion is 
that such a rule is too specifically targeted to make sense for Ingo 
in general.



Your best option, of course, is to have a SpamAssassin (or other spam 
filter engine) rule that recognizes these PDFs.

[quote] We use the "Ingo" filter plugin for Horde 
(http://www.horde.org/ingo/), with a standard IMAP backend.[/quote]

What filtering backend (client side filters, procmail, etc.) do they 
use? (If they don't know, you need to make this feature request 
through them and have them contact us if they need to). If they use 
IMAP filtering or something else that supports searching the whole 
message body and headers, you can probably do this. Otherwise it may 
not be possible unless the filter backend exposes a specific hook.

I am a SpamCop user and they use your application for the webmail 
service. Due to all the spam coming in now with PDF attachments, it 
would be nice if there were an option to filter messages 1) with 
attachments or 2) with attachments of a specified mime-type, such as 
"application/pdf".