When you "just" attach a document using your mail client behind the scenes it creates a multipart MIME document, encodes the attachment and embeds it into the data that is sent to the SMTP server. When you use Perl to do the same thing you also must create a multipart MIME document, encode the document and embed it the data sent to the SMTP server.
Your options are
- Write it all yourself
- Use modules from CPAN
What do you mean by "our web server will not install it"? Do you mean that your system administrator won't install it? If so install the library somewhere you have write access to. You can then add the directory to the search path Perl uses to find libraries.
perl Makefile.PL INSTALL_BASE=~njweatherman/lib
use lib qw(~njweatherman/lib);