If the agent is on the interaction and has not sent it, the threading back to the same agent will not work. What you could do is search for the incoming email address in the current interactions, get the agent name, then route that email using Preferred Agent Routing so it will go to the agent handling the current email. You will need to allow for multiple Emails coming in and if they are at full utilization, they still won't know about that new Email. Now, if you think your agents are very responsible and willing to monitor all emails coming into a queue and use manual assignment to pick that email up when it comes in, let me know their name and email so I can hire them. ;>)
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Robert Wakefield-Carl
TTEC Digital, LLC dba Avtex
Contact Center Innovation Architect
https://www.Avtex.comhttps://RobertWC.Blogspot.com------------------------------