Everyone - please do the following so this is raised as higher priority at Apple. The more people that submit, the higher likelihood we have that Apple fixes this.
In Mail, along the top toolbar, select "Mail"
in the dropdown, select "provide mail feedback"
a popup box will appear, click "continue"
it will take you to a webpage, where you will fill out information:
to make it easy for everyone, please inputthe following:
Subject: Mail keeps rejecting password
Comments: The Mail program keeps rejecting the password ansd stating it is incorrect. All the settings, including the server information is correct. The account and password are also correct. The issue with on Apple's side and the IMAP server keeps rejecting the password. Please correct this as soon as possible. Many people are having the same issue and errors. Thank you.