If you keep the same subject and sender, I believe you can.Can we send a follow-up email as a thread?
These options like copy/move to list are only available in the customer area, so you need to enable email box monitor for customers (Backend > Settings > Customers > Servers > Max. email box monitor: -1 ) and then you will be able to select those options.So, I tried creating an email box monitor but I do not see "copy to list". Below is what I see. Based on this how can I send follow ups to people who have not replied?
This option will be available in Customer area not in backend. Go to you customer account and try to create a email box monitor and check in that dropdown for "copy to list" option.So, I have an email box monitor sent to -1 however, I still do not see an option for "copy to list"