I thought I had already provide the following but I wanted to make sure you saw this. This is what I received from the developer who attempted the Perl install on the 64 bit server
perl -MCPAN -e 'install Net::SMTP'
I got the “don't know what it is.” warning

I also tried (NET was used in one of our earlier emails even though Net::SMTP was installed on the dev server):
perl -MCPAN -e 'install NET::SMTP'
I got the “don't know what it is.” warning
After looking up the names of the 2 authors (Graham Barr gbarr@pobox.com andSteve Hay shay@cpan.org):
perl -MCPAN -e 'shell'
cpan1> ls gbarr (Net::SMTP was not in his list…Net::TFTP, Net::SNPP and Net::PH were listed)
cpan3> ls shay (Net::SMTP was not in his list, nothing with Net was listed)

Searching for the module:
cpan10> m Net::SMTP
No objects of type Module found for argument Net::SMTP

And, I tried this just in case:
>br> cpan11> m NET::SMTP
No objects of type Module found for argument NET::SMTP