I have SMTP proxy services working great to route mail to my internal mail server. But now I need to support users on the outside of the firewall to be able to send email. I set the proxy to say that email can be sent by Internal users (to support people on the internal LAN) only because I am concerned that if I open the SMTP to External, it will relay for everyone.
Ideally, I would have it let my Extnernal users pass through to my internal server to verify they are authenticated to pass mail. But all I get now is 550 relaying not allowed. Am I missing something?
Additionally, I don't understand the consequence of creating users in Astaro and turning on SMTP. I use this function for people to VPN in.
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