Other sections in this FAQ:
UUCP
The MX records for some UUCP domains point to my local host. How do I get it to pass the messages on to UUCP?
How can I get Exim to handle “bang path” addresses?
We see something strange on our system in regards to mail coming in via rmail from a UUCP link. The sender is being set to mailmaster instead of the real sender, and a Sender: header is being added to the message.