Yes, the mail goes out up to 4:30 pm EST on Saturday. Anything that comes in after that time does not make it to the US Post Office until Monday morning. However, there is no mail call on the weekends for the inmates to receive incoming mail.
https://www.inmateaid.com/ask-the-inmate/does-out-going-mail-send-during-weekends#answer
Accepted Answer Date Created: December 13,2014