Unfortunately not and let me explain the reason for that and also how a plugin / mod should work when you'd like to modify the source code ;)Reason:Imagine the following situation:- A new ticket to request e.g. an installation of a software is requested by a user.- Agent Alice responds, no sorry we can't install the software- Agent Bob responds, yes sure we can install the software- In the osTicket interface Bob should notice that the ticket is locked (for the locktime specified in the Admin Panel) so that an situation like that is prevented, but with agents responding via email - I don't see a chance to prevent such confusing answers currentlyModification:I can imagine that a plugin / modification could help to solve that issue, but it requires some time and knowledge to modify the osTicket source code. I think of the possibility to switch the behavior of email answers for each agent in their personal settings (My preferences), so that the answer is eihter send to the end user or taken as an internal note. To avoid confusion (example from above with agents Alice and Bob responding at the same ticket with different statements), I would limit the possibility to send the answer to the end user in that way, that ONLY the assigned agent of the ticket can respond via emails to the end user. All replies from other agents (that are not assigned to the ticket) are taken as an internal note.Cheers,Michael