I am running an SBS 2008 server with Exchange 2007 configured and up until today at 9:24am - it was working properly. This server was installed brand new from Dell with a fresh install of Windows SBS 2k8 in June of this year (2010). I am an independent consultant and I rarely have to check on this client. I cannot think of anything that would have happened to make this server stop routing email messages to their inboxes. Lemme give some info (and I hope I don't forget anything!)
1. All MX records are set up and have been working properly as of June 2010
2. I am the only admin and I have not changed anything on this server.
3. Windows updates are not set to install automatically.
4. I can send from any user account on my internal network to several different emails outside of the internal network and these emails are received to my external recipients.
5. When I send email to an internal recipient from an external email, I do NOT receive an NDR message and it appears that the email is delivered successfully due to the fact that I can't tell otherwise because there is no return email of delay or non-delivery.
6. I can think of no changes made to the server that might cause this. Obviously something is going on, but I can't think of anything that I or any internal user might have done to cause this.
7. I am the only user to log into the server and access it.
8. This is small office of only 6 user accounts.
9. I CAN send email from an internal user A account to an internal user B account using the firstname.lastname@example.org email address and my user B receives the email from user A, and vise-versa. (Email can be sent internally).
Please give me some direction! I have scoured the Internet and all problems that have been solved are not issues that I can correlate to my problem!
Chris in San Antonio