It looks like he is trying to log in remotely over imap.
Again. I don't use RH, but I'm betting that some protection has been put in "for your own good" to keep you from logging into any of roots accounts from outside localhost. This isn't really a bad thing as it will make it impossible to brute force your root password, but I can see why it might be annoying. However, unless you are using a very secure connection it is a really bad idea to allow that kind of access anyway so maybe RH has done you a favor here.