How to Change the Password in Mac Mail

Change your email account password on the mail server. For most Web-based email services, like Gmail or Outlook.com, you can do this online by logging in to your account and changing the password for your profile. If you use iCloud email, its password is the same as your Apple ID, so log in to the Apple ID website (see Resources) and follow the onscreen instructions to change your Apple ID password. If it's an email account at work, contact your network administrator for guidance.
Launch the Mail app on your Mac computer. Mail asks you to enter your new password as soon as it tries to connect with the mail server. Enter the new password as prompted and click 'OK.' In most cases, this is all you have do do.
Click the 'Mail' menu and select 'Preferences' if you accidentally hit 'Cancel' when changing your password or if you disabled the account in Mail. Click the 'Accounts' icon, select the email account you want to change and then click the 'Account Information' tab. Delete the dots in the Password field and enter the new password. Click the red 'Close' button in the upper-right corner. The new password is saved automatically.
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