1. "Settings" > "Accounts" section > tap the account you want to configure.

2. "Sending mail" > "Outgoing server".

2.1. If "Authentication" is "Normal password": change the password in "Password" > tap "Next".

2.2. If "Authentication" is "OAuth 2.0": tap "Next" > (I haven't tested it, but I think what will happen is:) you will be asked to log in to your email account. Use your username and new password to log in.

korb,

Is your problem resolved?

If yes, then please click "Solves the problam" at the answer.

Thanks