How to configure mutt if my Centos server is behind a proxy server

We were in a network that did not have a proxy traffic through a jumphost and used mutt to send notifications when scripts finish running. Now the server has been moved to a network with a jumphost and all HTTP/HTTPS traffic is routed through the jumphost. What settings do I need to change in muttrc to send properly? Environment variables for http_proxy and https_proxy have already been configured in .bash_profile.