Hi Al,
The way I would do it is with a simple custom script and a form on your "Unsub Success" page.
<form method=post action=/mail/rem-feedback.php>
<textarea name=feedback cols=60 rows=5></textarea>
<input type=submit value="Submit Feedback">
</form>
Then set up a script "rem-feedback.php" to simply email you the result:
<?php$feedback = $_POST['feedback'];mail('you@example.com','Unsubscriber Feedback',$feedback,"From: \"ListMailPRO\" <noreply@example.com>");echo "Thanks for your feedback!";?>
Alternately, you could place it on your "Unsub Confirm" page but I recommend posting it to a new window...
<form method=post action=/mail/rem-feedback.php target=_new>
<textarea cols=60 rows=5></textarea>
<input type=submit value="Submit Feedback">
</form>
Hope that helps! :D
Regards