Kerberos Authentication Prompt Every Time You Send

For macOS users, if your SMTP server uses Kerberos for authentication and every time you send a message, Postbox prompts for Kerberos authentication you might need to do the following:

  1. In a Finder Window go to: /Library/Preferences
  2. Locate a fie that ends in .Kerberos and beings with the domain of your SMTP server (i.e.
  3. Remove this file
  4. Restart Postbox