$M
Whom we are masquerading as mc configuration
When you define MASQUERADE_AS using the
m4 configuration technique,
you both enable masquerading (MASQUERADE_AS mc Macro on
page 600) and assign the masquerade-as hostname to
this $M macro.
Note that defining $M will not enable masquerading. You
must use the MASQUERADE_AS m4
configuration command to enable this service.
You should never use this macro directly because it might change in a future release of sendmail. Use the MASQUERADE_AS mc configuration macro instead.
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