You don't need to install the module; you can just use it locally (assuming of course that you are allowed to do so on your machine).
I had never used Mail::Sendmail, but I looked at the source on CPAN, and there's nothing prohibiting you from using it in a local directory.
Just for fun, I took a copy of it, renamed it as Postal\Dispatch.pm, (modifying the package name within the file to Postal::Dispatch too, of course), and ran the following program:
#!/usr/bin/perl -w
#
# Test of local copy of Mail::Sendmail (renamed as Postal::Dispatch
# to be sure it works on its own :-)).
#
use strict;
use warnings;
use Postal::Dispatch;
my %mail = (
To => 'liverpole@myISP.net',
From => 'liverpole@golux.com',
Message => 'Hello to myself from Postal::Dispatch',
);
sendmail(%mail) or die $Postal::Dispatch::error;
print "OK. Log says:\n", $Postal::Dispatch::log;
And sure enough, I got the mail it sent to my ISP!
The only other change I had to make was to the %mailcfg hash in the Mail::Sendmail module:
'smtp' => [ qw( localhost ) ]
which I had to change, of course, to:
'smtp' => [ qw( mail.myISP.net ) ]
s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/
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