If you have registered an email account, you can log on to the websites of common email service providers, such as 163, 126, QQ mailbox, etc., and check your email number in your personal account information. The specific operation method may be slightly different, but you can usually find your email number in the options such as "Personal Information" or "Account Settings". If you forget your email address, you can try to retrieve it by using the bound mobile phone number or other identity information.