Introduced in release: 8.0.1
alternate_recipient_mode MTA option controls the order in which additional alternate recipients are added to an existing alternate recipient list. Possible values are:
- old recipients follow new recipient
- new recipient follows old recipient
- new recipient replaces any old recipients
- new recipient is silently dropped if any old recipients are present
The default is 0, which is consistent with military messaging requirements.
The default value is: 0