I wondered if the subject of delaying or sending outgoing emails later has ever been asked for in osTicket? I would like to see this either as a feature or perhaps a plugin that could be added.
The reason for this is that more often our support team are able to respond very quickly to tickets and on occasion, they may have given incorrect information and realised it directly after sending. Ideally it would be great to be able to rescind the response to a ticket and by definition the email to the customer.