troubleshooting Question

Sending email from DMZ web server using Exchange 2010

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RISLAFlag for United States of America asked on
ExchangeVulnerabilitiesWindows Networking
6 Comments1 Solution1866 ViewsLast Modified:
I've been working on allowing my developers to send emails (Forgot password) from our DMZ web server - Securely.

I enabled SMTP from the DMZ web server IP to the exchange server IP on our firewall.

Set up a new receive connector using only the DMZ web server's IP address and port 25.
         -Tried every combination of check boxes (TLS, Basic, Externally secured, anonymous, ect...)
         -The ONLY way the email goes out is if I check off "Externally Secured".
                     -All other combinations return 571 - Authentication errors.

Here is my question...

With "Externally Secured", am I at risk of having someone outside of the company use my exchange server to send email?

If so, what other options do I have...other than Externally Secured?

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