Each of those header lines (and the last dot) needs to be on a different line IIRC. So: 
            open( MAIL, "| $sendmail -t" );
            print MAIL "To: $_\n";
            print MAIL "From: $adminmail\n";
            print MAIL "Subject: $subject\n\n";
            print MAIL "$message\n";
            print MAIL ".";
            close(MAIL);

            print "Email was sent to: $_!<br>";

[download]
If that doesn't work, then I suggest you read up on the docs and try to send a message manually the same way to see if that works.

Update Also, shouldn't $message | $subject eq "" be something like $message eq "" || $subject eq ""? Or more cleanly, !$message || !$subject.

In reply to Re: Sending looped emails by The Mad Hatter
in thread Sending looped emails by sulfericacid

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