LOCAL_RELAY mc Macro
Unless you specify otherwise, any address that is a
username without any @host part
is delivered using the local delivery agent. If you prefer to
have all such mail handled by a different machine,
you can define that other machine with the
LOCAL_RELAY mc macro.
Note that a relay is different from the knowledgeable hub defined with MAIL_HUB. (See later in this chapter for an illustration of how MAIL_HUB and LOCAL_RELAY interact.)
This mc macro is deprecated because it doesn’t work well with some MUAs—for example, mh( ). This is because some MUAs put a host part on all addresses even if only the user part was specified.
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