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    if ($word =~ /[\w.-]+\@\w+\.\w/) {
        # looks like an e-mail address

    for my $addr (@mail_to) {
        print SENDMAIL "Bcc: $addr\n";
...
    print SENDMAIL "Subject: South African tourism survey \n";
    print SENDMAIL "Content-type: text/plain \n\n";
    print SENDMAIL $content;