Yes, it is called Inmate Response Letters in your Account Dashboard.
https://www.inmateaid.com/ask-the-inmate/hi-can-an-inmate-reply-back-to-me-on-this-site-or-shall-i-say-how-can-someone-reply-back-to-me-once-i-have-written-them-a-letter#answer
Accepted Answer Date Created: May 05,2019