Prior to V8, Sun's sendmail used the
R option to cause all mail to be automatically routed to a
mail hub machine. V8 sendmail coopted the
option for its own use, so Sun had to switch the option name to
> option is available only with V6/Sun,
and above, configuration files.
> option is used like this:
If the entire
> option is omitted, all mail is
delivered locally. If
mailhub is present and if it is
not the name of the local host, all mail is forwarded to that machine
for delivery. If the
mailhub is omitted and if
/var/mail is NFS mounted, all mail is forwarded to the
host that is exporting /var/mail. The name of the
mailhub, no matter how it was determined, is assigned
$K macro for use by rule sets.
Be aware that by setting and using this option, you are letting
sendmail's internals make all the decisions for
you. If you prefer more control, investigate the
nullclient FEATURE described in Section 19.6.20, FEATURE(nullclient).