Well, how many email addresses do you have? Go through them one by one in the login screen. Leave alone the password, just enter your email address/es and hit "OK".
When you found the right account, it will say something like "Incorrect password". Now just enter your password, which is likely the same you need to enter, when you want to check your emails. If you, for some reason, can't seem to find the right password, but have access to your email accounts anyway, click
this link and enter the email address that worked in the login screen.
