Lately I have been building something, and sending transactional emails via api is easy with resend and couple of other services. But receiving been pretty difficult for me when I want to thread the replies easily and quickly?

My use case is that from web based email client we have to send transactional emails and users can reply to it and I need a way to receive them and thread them properly in my db like have proper relations between parents and children. I know with ses we can do that but I want a simple way for it.

did you guys find any service good for this? that can receive and thread emails or help me thread email responses pretty easily and in simple way.