By Richard Hsu
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How to Get Two-Factor Authentication (2-Step Verification) Working in Mac Mail

To get Two-Factor authentication (or what Google calls 2-Step Verification) working with Gmail and Mac Mail app, you need to enter the App password in two places (incoming and outgoing).

  1. In Mail > Preferences, go to Accounts
  2. Click on Google, enter the App Password in the Password field (this is for incoming mails)
  3. Click the drop down for Outgoing Mail Server (SMTP), pick ‘Edit SMTP Server List…’, paste the App password again. This is for outgoing mail.

Same applies for outlook.com (live.com, hotmail.com) or yahoo mail. You need to enter the application specific password for both incoming and outgoing.