James,

I'd like to first apologize for some confusion that got created because I misunderstood your post. I interpreted your wildcard comment as a question instead of a recommendation and therefore, answered it incorrectly. We have added your suggestion to http://xeams.com/using-iis-cert.htm . Let us know if we should further modify it. The link in the earlier post ends with a ] which resulted in a 404 on your end.

Answer 2: Again I apologize. I did not mean any disrespect.

Answer 3: Here is a flow chart.

Answer 4: Yes, but only if all of the following conditions are true:

• Exchange accepts the sender and recipient
• AD is configured
• The Use Active Directory option is checked for SMTP Proxy Server

Note that until recently, AD was only used when using the regular SMTP server. However, Microsoft changed the way they reject invalid users in Exchange 2013 and 2016. They no longer reject invalid users after RCTP TO. Instead, they reject the email after DATA, which breaks the logic in Xeams. Therefore, we had to add AD integration for Proxy Server.

Answer 5: This is partially answered by #4. If you are installing this on a large scale, I'd recommend NOT using the Proxy Server but using the Regular SMTP Server for both inbound and outbound. I say that because:

• The regular SMTP server can forward messages to multiple Exchange servers on the back-end, where as the Proxy can only talk to one
• If your Exchange goes down, Proxy will go down along with it. The regular SMTP server will queue the messages until Exchange comes back up.

I also recommend checking http://www.xeams.com/clustering.htm to see how to use Xeams in a large environment.