One of the most common scenario, you got e-mail from your boss saying, I cannot sent e-mail to firstname.lastname@example.org, (-:, and what you will do? How you will know quickly if the destination SMTP server accepting mails for email@example.com? Go to below URL, www.testexchangeconnectivity.com
I think it is very useful tool, and if you remember DNS stuff old days when it was free we had similar functions to speed up troubleshooting steps. Seeing this from MS is really nice, and I wish we all are given more tools to test issues related to exchange servers when we needed.
This tool will help you to identify quickly if such SMTP address is able to receive e-mails, the IP addresses for the destination SMTP domain, open relay test and more.
Oz ozugurlu MVP (Exchange)
MCITP (EMA), MCITP (EA) MCITP (SA)
MCSE (M+, S+) MCDST,
Security+, Server +, Project+