Windows 2008 的 SMTP 寄信時若遇到 "Helo command rejected: need fully-qualified hostname" ，可做以下的修改。
The fix is easy:
- Open IIS
- View the properties of you Default SMTP Virtual Server
- Go to the “Delivery” tab
- Click the “Advanced” button (in the bottom right corner)
- Under “Fully-qualified domain name” enter a domain name that points to the server
- Click Ok until you’re back to IIS