How do I find my Apple Mail password in High Sierra?
How do I find my Apple Mail password in High Sierra? and, How do I change it?
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Apple has made it difficult to see them, especially if one of the Auto setup choices, but...
Open Keychain Access in Utilities, then either check the Password under that item, change it, or delete it and start over.
Enter the part after the @sign in the search bar.
You may have duplicate or more entries in Keychain Access.
If using a browser to login via WebMail works it's not Name or Password, but likely old passwords interfering.
There''ll be at least 2 entries, maybe more.
The trouble is that Mac Mail almost always chooses the old Passwords if you don't change or get rid of the old ones