I've been having the same problem with email as a lot of members on the TT community have
I have four TT email accounts for business and personal use. Three are working fine but my main email account that I use for buisness has not worked since the 10th January 2016
The error is telling me to check my username or password, neither of which I have changed recently
As per this post
http://community.talktalk.co.uk/t5/My-Email/I-cannot-access-my-tiscali-email/m-p/1833120#M52772
As per the post instructions I have completed all the releveant details in the 'Private notes' section of the 'Community Profile'
Please help!
Thanks in advance
BH