Role in UUCP
UUCP is an old-style means of moving email between machines that are only connected with dial-up modems. The line in the configuration file that tells sendmail how to transport over UUCP might look, in part, like this:
Muucp, P=/usr/bin/uux, F=DFMhuUd, S=12, R=22/42, M=10000000,
This line tells sendmail to send UUCP network mail by running the /usr/bin/uux (UNIX to UNIX eXecute) program.
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