Mail app and outbound server issue

Hey all,

I have tinkered in the past with this, but finally decided to figure out why i could not send emails out from my ISP. Turns out they block it completely and only will allow emails sent from my home server if i use their outboud email server. I get the following info…

I am not sure if it possible to have a way to setup the outbound email server to something else… anyone else run into this?

Well I think this is the state of self-hosted email these days. Not sure what to do really other than send through existing mail providers.