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I have a WordPress site that sends email from a form. It sends one to a Hosted Exchange account I have with AppRiver and that one always comes in. It also sends one to a POP box on my smarter mail server but that one never appears to arrive. Which log file should I be looking in on the smarter mail server to see any attempted communication between the WordPress site and my smarter mail server? I was thinking SMTP or Delivery but neither seem to show anything.