how come i dont get incoming email address

Device or computer?

IOS

Have you tried deleting the account, restarting the device, and then adding the account back?

Mail – Setup on a device    

Mail - If you can't receive email on your iPhone, iPad, or iPod touch     

OS

Troubleshooting Apple Mail

What does Mail/Window/Connection Doctor Show? If the server is red, select it and look at the Show Details box.

Mail: Mail troubleshooting 

Mail: If you can’t receive messages.    

Mail not sending or receiving messages after updating OS X.      

Mrwarrior702 Said:

"how come i dont get incoming email address: my question is that i haven't got any incoming email in my mailboxes"

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Try a New App Password:

Do you use an App Password? If so, then it may have expired, and, as a result, you would need to use a new one. So, create a new App Password, and then use it for the account to Mail. Contact your eMail provider, if you are uncertain as to how to create an App Password.