Most of the websites store cookies and cached files on the computer. This provides access to the protected sections of a website or to speed up the access. There are times when the cookies and caches become corrupted in that case you have to delete the cookies and caches to gain access to the account. If you need any help, then call in the ATT email support number
for resolving the issue. You can deactivate extra tools that may interfere the access to the email account.