Comment 1 for bug 299780

Now that I understand the code better, I went back to look at this. This handler is only used for approving messages via email, which we never use. I believe that not having this code (the code I removed) means that people can't send an unsubscribe request via email (we are testing that elsewhere), and since we don't advertise that this is possible, that's fine with me (I thought we were deflecting them to systers-owner in any case.)