Role in Network Transport
Another role of sendmail is that of transporting mail to other machines. A message is transported when sendmail determines that the recipient is not local. The following lines from a typical configuration file define delivery agents for transporting mail to other machines:
Msmtp, P=[IPC], F=mDFMuX, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP/HdrFromSMTP, Muucp, P=/usr/bin/uux, F=DFMhuUd, S=FromU, R=EnvToU/HdrToU, M=100000,
The actual lines in your file might differ. The name smtp in the preceding
example might appear in your file as ether or ddn or something else. The
name uucp might appear as
suucp or uucp-dom. There might be
more such lines than we’ve shown here. The important point
for now is that some delivery agents deal with local
delivery, whereas others deal with delivery over a
network.
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