After many user requests Empathy, the default Gnome Instant Messaging client, in it’s version 3.0 will have a blocked/denied contact management management window..Below are some screenshots of this new feature:

Some menu entry, at the chat menu and the contact context menu, were added also.

According to Chandni Verma in her blog post this new feature almost didn’t entered in this release, since a Empathy development was in freeze to translations. But the i10n team allowed an exception because this feature was "too cool not to be available in this release".

Source: Planet Gnome