OK I just got off the phone with another mail admin who claims his helo bogus is by design. He clained it is a security feature so the inturnal structure of his network can not be figured out.
Could somebody explain this logic to me???? I can not figure out why a hacker/cracker would need or even use dns to locate a service.
That's the logic often used by people who don't understand computer security. :)
If his mailserver sends you an E-mail, you have his IP address. From his IP address, you can find out the name of the mailserver (assuming that he has a reverse DNS entry, which is a virtual requirement these days). So you already know the information that *should* be sent. Not sending that information just means that they don't know much about administering a mailserver, or don't know much about security -- making them a *more* likely target for hackers.
-Scott
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