How do I block an email from sending me admin mail?

[BonsaiNut]

The issue is that the email "sender" is my admin account. In other words, vBulletin "forwards" all admin emails to my email server. I can't mark them as spam, because then my email server would block ALL emails from my web site. I receive plenty of legitimate emails every day - I just also happen to receive emails from this disgruntled user.

It is strange that a user with a banned account can still spam the site with emails.

**EDIT** Never mind I figured it out. Even though Outlook was DISPLAYING the author as the site administrator, it actually kept the original email in the "sent" field. The solution was the most basic - of course Outlook just made it LOOK complicated. Thank god for Microsoft.