# Find out if, and why not (if not):
my ($is_valid, $msg) = verify_email('$tmp_EMAIL_lc');

One possible reason the  $tmp_EMAIL_lc e-mail address is always bad is that the single-quotes of the expression  '$tmp_EMAIL_lc' do not interpolate, so what is passed to  verify_email() is always the literal string '$tmp_EMAIL_lc'. 

c:\@Work\Perl\monks>perl -wMstrict -le
"my $tmp_EMAIL_lc = 'this will not interpolate';
 print '>$tmp_EMAIL_lc<';
"
>$tmp_EMAIL_lc<

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Use double-quotes or, better still, no quotes at all.

Give a man a fish:  <%-{-{-{-<

In reply to Re: Verifying Email Addresses by AnomalousMonk
in thread Verifying Email Addresses by knuppn

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