One of my flock has talktalk- He asserted that without leave or consent his mail started coming in on a Gmail account ,assive TT and decided that was the way to go.
Then he found[hecsays] the Gmail account has changed to another, again without any doing on his part.
So are TT playing games or is he getting a little bemused?
He is I have to say getting on a bit- but I am sure he would be aware of setting up Webmail accounts
So did you check if is he using Webmail? or mail client on pc? if so then which?
It will be a case of going into gmail on Webmail server (I would think) and unticking/changing the collection of talktalk email. Also need to check on TalkTalk webmail server if there is anything there to untick/change to stop it forwarding to gmail.