What is the BADMAIL folder?

NPC receives mail from the external POP3 server then sends it through the internal SMTP server. If at sending there are any errors, the message is moved to the folder BADMAIL.

To learn what error has occurred, look in the log of the program: NPC-*.log. After the problem is resolved, it is possible to move messages back to the temporary folder for incoming messages of the connector. The program will send them automatically.