I am using Mac OSX Server
I need you to correctly configure SMTP Mail Relay for Outgoing Mail.
1. First attempt ISP Mail Relay (Comcast)
and if that doesn't work
2. SendGrid or some other free mail relay
$30 TeamViewer, paid on completion
Hello
I can help you to set up your Mail Server on OSX with the additional SMTP relay. I do have extensive experience with OSX since its inception and with Apple products for over 30 years.
If you would like to send through some additional details, including which version of OSX Server you are running, we can discuss further and confirm from there.
Thank you
Darren