in reply to CGI recipient Option

BTW, I am surprised that the email works. You don't have a blank line between the header and the body. It should be: 
print MAIL "Content-Transfer-Encoding: 7bit\n";
print MAIL "\n";
print MAIL "<html><head>\n";

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And the From: and the Reply-To: lines are probably not formatted correctly. They should look like: 
Reply-to: Some Name <some@address>
From: Some Name <some@address>

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In Section Seekers of Perl Wisdom