Facing technical problems in Apple mail then seek assostance on Apple issues by dialing toll free number provided for Apple Mail technical support. Follow below given steps for password reset for Apple ID.
Apple id password reset , discuss apple mail tech support and service
If you have forgot the apple password all you need to do is take help from Apple mail tech support and service for the same go on the mail app and look on your device either Ios or on your mac for the concern or through trouble shooting .
In case if your have forgotten the mail fololw the steps mentioned below.
I.e. it will vary if you are two factor authentications or if you are using security questions.
On your Mac – click on system preferences, Icloud and then on account details it will give you options click on security, reset password however it will require the password which you have used to unlock the Mac and the needful will be done .