A 5.6M attachment encoded for mail could be about 8M.
MIME and uuencoding
will always increase the file size sent.
Honestly email wasnt designed for large attachments.
When I have something big to send I put it a temp folder
on my web site and send the reciepient a link to my web page
like:
http://www.example.com/BIGATTACHMENT/filename.zipAlso this way you can easily transfer large files
without worring about their mailserver stripping EXEs, DLLs....
Hope this helps