Filtering out calendar invites?

[Lars-Johan Liman]

Hi again!

(I'm positively surprised at the amount of list traffic my previous
simple question generated and very thankful for the attention it got, so
let's see about this one. ;-) )

I use the "imap" backend to download all mail and I want to filter out
messages that contain calendar invites in my incoming mail flow.

The trigger is that they contain a MIME message part with "Content-Type:
text/calendar".

I understand that the body may not be downloaded at the point of
splitting, but the IMAP protocol has the ability to list the
content-type of all MIME parts of a message on the server.

Is it possible to access that list of MIME parts and use it in a custom
function "(: (lambda nil ( ...)) )"in the nnmail-split-fancy variable?
If so, please hint or point me to RTFM.

Or is there a better/simpler way?

                                Cheers,
                                  /Liman
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