Alias private and alias public alias options

Alias options:  and
The  and    alias options are analogues of the &#x5b;PRIVATE&#x5d; and &#x5b;PUBLIC&#x5d; alias file named parameters. The  alias option  specifies that the associated alias is public and hence can appear in any constructed header lines. The value specification is currently ignored and should always be. is the default. The  alias option specifies that the alias is private and should appear as an empty group construct in message headers. The value specification is used as the name for the group. Neither   nor   have any effect if the    alias option is also specified.

Note that these parameters are only valid when headers are originally being constructed, as for instance for messages submitted via the L channel. These parameters are not relevant for incoming messages (such as incoming SMTP messages) for which the headers are already present in one form or another.

See also:
 * Alias options
 * Alias file named parameters
 * alias_header_expansion Option