I never tried it, but I think you can use sendfiles, a shell script from nmh - Message Handling System. Its man page says:

The  shell  script sendfiles, is used to send a collection of files an
+d directories via
electronic mail.

     sendfiles mailpath "subject" files ...

sendfiles will archive the files and directories you name with the tar
+ (1) command, and
then  mail  the  compressed  archive  to  the `mailpath' with the give
+n `subject'.  The
archive will be automatically split up into as many messages as necess
+ary in  order  to
get past most mailers.
[download]

This should solve your problem. Ciao, Valerio