I suspect (but I might be wrong) that the OP is talking about their email. I have a BT email address (ie
[email protected]). This is also servicable via Yahoo. When I click on my desktop icon for mail, it takes me directly to my email. I don`t sign in. The alternative method of accessing my email (via the web) is to go onto the BTYahoo website and input username and password. I only do this when I am away and am using my phone. A while ago, I had a letter from BT stating that if I don`t input my username and password once in every 6 months, my account will be cancelled. Maybe this is the case with the problem that the OP is experiencing.