Missing recipient group text MTA option

Alias and address MTA options:  (string)
The  MTA  option specifies the phrase to use when generating an empty group construct; that is, the phrase used when    (MTA-wide)  or   (channel level)  is being applied. The default phrase, if this option is not set, is " ".

See also:
 * Alias and address MTA options
 * missing_recipient_policy MTA Option
 * missingrecipientpolicy Option