Hello, I've noticed some odd behavior with my Exchange 2010 box. I was configuring email notifications for my antivirus and virtual machine backup servers and I noticed that my mail server no longer requires authentication to send those alert messages. Essentially all I have to do now is specifiy the Exchange ip address and the recipient email addresses and they'll go through the mail server without prompting for a valid username and password. I'd really like to change this behavior, but I'm not sure where to start. I believe I have all the correct authentication requirments, but I'm not 100% sure. Any help would be greatly appreciated! Thank you!