This is a problem affecting many with legacy email addresses that TalkTalk have taken on. Not just Tiscali.
Going back to last year, I tried to change password but to do this the email needs to be in 'my account', but the TalkTalk system would not accept then, so although able to carry on using the Tiscali email, was unable to change password, everytime I complained to TalkTalk about my line speed(another story of woe) I would also complain about email, they always promised to sort it but never have.
In the last few weeks TalkTalk have been making changes the result is all legacy email accounts need to update password (found that only after phonig them), for an address in 'my account' this should be possible (although it took an hour to sort mine) but for addresses such as my main one not in 'my account' there is no way to update.
I am now having to work throu my contacts to change address, so take PayPal, it's go to website and add new address, go to email and click on link to verify, then go back to website and make email new primary address, all takes time, and with multiple banks and share dealing companies and lots more it's a complete pita
p.s. I did sort out the mail forwarding problem in the end as well.
Edited by burble (Wed 02-Nov-16 19:26:58)