m4 suffix) that is in the directory cf/siteconfig.
That file contains a list of SITE declarations (described earlier). The host is
the UUCP node name of the local host. The class is the name (one letter, or multicharacter)
of a class that holds the list of UUCP connections. For example:
SITECONFIG(`uucp.arpa??,`arpa??,`U??)
SITECONFIG(`uucp.arpa??,`arpa??,`{MyUUCPclass}??)
Here, the file cf/siteconfig/uucp.arpa.m4 contains a list of UUCP hosts directly connected
to the machine arpa. This declaration would be used only in the machine
arpa??™s mc file. The list of UUCP hosts is added to the sendmail class-macro $=U in the
first example, and $={MyUUCPclass} in the second.
Some single-character letters are special. The special letters available for local connections
are U (for uucp-old), Y (for uucp-new), and Z (for uucp-uudom).
A second form of the SITECONFIG mc macro is used by hosts other than the host
with the direct UUCP connections. It is just like the earlier form but with the full
canonical name of the host:
SITECONFIG(`uucp.arpa??,`arpa.Berkeley.EDU??,`W??)
This also reads the file uucp.arpa.m4, but instead of causing UUCP connections to be
made locally, it forwards them to the host arpa.Berkeley.EDU.
The hostname that is the second argument is assigned to the $W sendmail macro. The
class $=W is set aside to hold lists of hosts that appear locally connected.
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