There are several people tweeting that they are unable to send or receive email on BIS. Not many details regarding this outage yet. I have tried to send an email myself and it was a no go. Haven't even seen this come across DataOutages.com yet. The details I have so far is that it is affecting more than just one carrier. It is unknown whether or not it is just a particular region or not. So far it only appears email is affected.
Are you having issues?