We have new email servers that we are moving customer to. The move is happening 'behind the scenes' and no server settings on customer email programs will need to be changed. However, there is a minor change that impacts POP3 users regarding a change in how messages we mark as spam are delivered. If you you use POP3 to collect email then please read: https://support.aa.net.uk/POP3_Tips for further information.
Please do get in touch with us if you have any questions or concerns about this though.