NOTE: This article is for informational purposes. ISN is not affiliated with Yahoo in any official capacity and cannot help you troubleshoot anything else in your Yahoo account.
Yahoo mail now requires you to enable less secure apps to work with ISN for SMTP.

  1. Sign in to Yahoo Mail.
  2. Go to your "Account security" settings.
  3. Turn on Allow apps that use less secure sign in.
  4. Confirm your identity
  5. You're all set!  See the screenshots below for each step.

Yahoo will automatically save this for you, there is no SAVE button.

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