iMessage receiving but not sending in El Capitan - MacBook Pro Late 2013
Since upgrading to El Capitan (10.11.1), I can receive messages on my Messages app, but I cannot send. I get a red exclamation point every time I try to send.
iMessage account (linked to my iPhone number & apple email) is enabled in preferences > accounts.
Any thoughts?
MacBook Pro with Retina display, OS X El Capitan (10.11.1)