Thanks for all your suggestions guys! What I had to do was 'use' the SendMail module like this:- 
use lib "Mail::SendEasy";

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This page was where I got the answer from :- http://perl.apache.org/docs/general/perl_reference/perl_reference.html#use____require____do_____INC_and__INC_Explained

In reply to Resolved: Difficulty in sending mail with Activestate Perl 5.10 on a windows server by Stoney
in thread Difficulty in sending mail with Activestate Perl 5.10 on a windows server by Stoney

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