[exim] Exim / POP3 with Compressed mails

Hi!

Is there anyway to make Exim compress the mail when saving in in the users
maildir?
For instance:
post_save_command = bzip2 $file_name

of something like that?

On the other hand, is there anyway for the Courier POP3D daemon to
"uncompress" the file before streaming them to the user via TCP/IP??

This must be a common "wanted-item" by many SMTP/POP3 sever installations
out there.

/Charlie