POP Peeper FAQ

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Server Settings

  • Yahoo: IMAP security (Oauth2)
  • Yahoo has started blocking normal login methods for IMAP/SMTP -- first reported around June 2016 -- in favor of using the OAuth2 login method. Yahoo will report an error of:
    ([AUTHENTICATIONFAILED] #MBR1212 Incorrect username or password.)

    In this case, you have 2 options:

    • Use the OAuth2 login method (recommended for improved security): Edit your account in POP Peeper; press the 'OAuth2' button and follow the instructions
    • Disable OAuth2: Use the following URL to disable OAuth2 in your Yahoo account:
      https://login.yahoo.com/account/security
      Enable: "Allow apps that use less secure sign in"