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"Error sending email: Email::Send::Gmail: no valid recipients at /usr/
+lib/perl5/site_perl/5.8.8/Email/Send.pm line 252 at /usr/lib/perl5/si
+te_perl/5.8.8/Email/Send.pm line 252"

my $multiple = 'test@one.com,test@two.com';
                
...
    );
 eval { $sender->send($email) };
print qq(Error sending email: $@) if $@;

my $multiple = 'test@one.com';