Question: How do I check for remaining days of Remote Desktop Services grace period if the server is also a Domain Controller (so I cannot logon as local admin)?

Answer: 
I've discovered this is an error due to PLESK (and the user), and because there isn't much documentation on it, I think this post is worth keeping.

Because I had the vhost domain of the email address I was sending to established in PLESK, it tried to revert to a local Postfix search when it recognized the tail end of the email address as something it thought was hosted on the server itself. 

There is documentation on how to fix this in the PostFix configuration file [here](http://www.luketarplin.com/blog/fixing-postfix-plesk-configuration-problem).

I appreciate everyone's efforts.
I had this issue too. Any email being sent to my company domain was being sent locally. This is (I believe) because in Plesk (yes it's a Plesk issue). 

So basically it's going oh soandso@company.com is the registered user lets send any @company.com emails locally or something like that. 

Anyway, I have had to fix this twice now and I did it by editing the /etc/postfix/main.cf file and commenting out the lines that started with "virtual".

See <http://www.rcneil.com/postfix-local-loop-in-plesk/> for instructions on how to fix the issue