Forwarding to a Knowledgeable Host
After handling mail destined for the local host, the
parse rule set
0 generally looks for addresses that require a
knowledgeable host to forward messages on the local
host’s behalf. In the following rule, the $B
sendmail macro ($B on page 808) holds as its
value the name of a machine that knows how to
deliver BITNET mail (Relays on
page 602):
R $* <@ $+.BITNET> $* $#esmtp $@$B $:$1<@$2.BITNET>$3 user@host.BITNET
The tag .BITNET
would have been added by users when sending mail.
Note that BITNET
in the LHS is case-insensitive; a user can specify
Bitnet,
bitnet, or even
BiTNeT, and
this rule will still match. A similar scheme can be
used for other specialty addresses, such as UUCP and
DECnet.
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