My email address now has 111 in front of it

By any chance to you ahve a GMail account?

I found this.

SMTP ERROR: Failed to connect to server: Connection refused (111)
Is it happening with anything you send and are you getting your emails returned with this prefix? Just a thought.

I would change it too!

I would change it if it were me. Sounds dodgy.

I have never heard of this.
This what I would ask myself.

Has my my email been hacked? I would change my password just in case. If you can't change it, you have been hacked.

Have you tried sending an email to yourself and see what the address is?

I would contact my provider if it is a BT, Virgin generated one to ask.

Otherwise, I have no idea.

I'm sure someone on here can advise you.