Take a trip through the documentation and note where it refers to multiple addresses. Just because you represent something in outlook one way doesn't mean that's how it's represented when it's sent out. Try the following instead:

$address= [ qw(one@example.com two@example.com) ];
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This assigns $address to an anonymous array containing the two addresses. For more information, check out perldata and perldsc.

Hope this helps.

antirice    
The first rule of Perl club is - use Perl
The ith rule of Perl club is - follow rule i - 1 for i > 1