First: get some sleep! Second: learn how to reference Perl data structures. Maybe that sounds harsh, but you've got some very basic syntax problems which you need to resolve before you can write a script that does anything useful. For example:
sendmail ( ${ %params } );
That simply makes no sense at all. It's trying to treat a hash as a scalar-ref! There's just no way that can work - until that's obvious to you there's really not a lot we can do for you aside from rewriting your entire program.
If your books aren't making sense, perhaps take a read through perldata, perlref and perldsc.
-sam
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