This might involve using a different email address and password, depending on how the My BT link was activated.
Logging in via My BT offers access to all BT email addresses.
This means BT Mail users possessing more than one account will not have to log in separately to view their different BT accounts.
BT Mail users who have yet selected a favourite email address should, therefore, select one.
Although not compulsory, users with more than one email address can, as a result, receive quicker access to the email address used the most.