[exim] exim and attachments

hi,

i need infos about attachments, which are sent through the local
mailsystem. Mailsystem is build up with the following components:

exim ->mailscanner ->exim -> procmail (if local)

i need infos from attachments like:
    name; size; mfrom; mto
in a logfile or so.

How i could realize it? Any suggestions?

thx
Lars