This is a known issue affecting Gmail and Hotmail.
Google and Microsoft are working with TalkTalk to find a solution.
Staff here will pass your details onto the tech team to add to those already under investigation.
Sometimes getting your contacts to add you to their approved contacts helps.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
