+allmasquerade If masquerading is enabled (using MASQUERADE_AS), this
+ feature will cause recipient addresses to also masquerade
+ as being from the masquerade host. Normally they get
+ the local hostname. Although this may be right for
+ ordinary users, it can break local aliases. For example,
+ if you send to "localalias", the originating sendmail will
+ find that alias and send to all members, but send the
+ message with "To: localalias@masqueradehost". Since that
+ alias likely does not exist, replies will fail. Use this
+ feature ONLY if you can guarantee that the ENTIRE
+ namespace on your masquerade host supersets all the
+ local entries.