InmateAid sends letters daily through USPS, you get notification in your member account the moment they are mailed. Inmates do not have access to the Internet and can only correspond through the mail with stamps they buy at the prison commissary
https://www.inmateaid.com/ask-the-inmate/will-i-receive-any-confirmation-that-the-inmate-that-i-sent-an-e-letter-to-received-my-letter-also-are-they-able-to-respond-to-e-letters#answer
Accepted Answer Date Created: March 01,2013