Sky have been outsourcing their email to Google (of all the wanky places to give it to) over the past year. This weekend just gone they completed the process and switched off their own SMTP email servers. Without telling me (or any other Sky customer I know). Switching to Googles SMTP server (smtp.tools.sky.com, enable TLS, port 587) works but your email address in the from line is replaced with your sky.com one. Bastards. FERITE. I'm off to another ISP.