I am a somewhat new BES Admin for a very small organization and one of my users of an 8830 has a strange email issue.
He can email to most people (including me who is on a different domain and exchange server) but certain people he can't email (he just gets the red X). He can't even respond to an email from these people that he has trouble with.
I checked to confirm his "Send as" permissions were correct (even though they would have to be in order for him to be able to email "most" people). I also confirmed he has no filters set up.