Emails that are only sent manually usually can’t be disabled via the Prepared Emails interface because they’re only sent by choice; disabling them would be pointless. The gift emails in particular aren’t attached to anything because OJS 3.x doesn’t include payment support until OJS 3.1.
Regards,
Alec Smecher
Public Knowledge Project Team
Those are legitimate OJS emails, but aren’t currently attached to the workflow until the payment tools are implemented in OJS 3.1. There is no need to delete or disable them – they are not currently active.
Regards,
Alec Smecher
Public Knowledge Project Team