I use a comma separated list, not an array.

my $rd_list = 'a@a.com, b@b.com, etc@etc.com';

$sender->MailFile(
{
    to => $rd_list,
    subject => 'Test',
    msg     => "All,
Please ignore this email!  This is a test.

Thanks,

cc\n",
    file    => $complete_file_path,
});
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