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.
> 
> Apr 10 10:26:29 ######### postfix-local[8331]: postfix-local: 
>  from=my.valid.email@myserver.com, to=name@company.com,
>  dirname=/var/qmail/mailnames Apr 10 10:26:29 #########
>  postfix-local[8331]: cannot chdir to mailname dir name: No such file
>  or directory Apr 10 10:26:29 ######### postfix-local[8331]: Unknown
>  user: name@company.com
> 
> 
> 

Contrary to what you may think, these are not postfix logs.

Postfix prefixes all log messages with `postfix/<servicename>` - never `postfix-<servicename>`