Reverse DNS is a site that displays reverse lookup results for approximately 4.3 billion IPv4 addresses in a map-like manner. This is what it looks like when you access the site. I can't tell what it ...

Over the past few days, we have found that several ISPs put us on some type of block list that didn’t allow our mail through. … One told us that the only way it would allow the mail through would be ...

Last week we began to discuss the records that DNS servers use to describe their view of the name space they are responsible for. We didn’t get beyond the Start of Authority (SOA) record, but as that ...

Ok guys here's my setup. I have an exchange 2003 server running for our internal office lan, for internal mail. I connect to a pop3 mailbox and download all the emails to the exchange server and ...

When a search engine spider, bot, crawler visits your site, they should all be capable of passing what is known as a reverse DNS test. I have details on how this works over at this article. A ...

I've got a Windows box that has been running our external DNS service for years. All of a sudden, the reverse DNS functionality has stopped working. Some mail servers are no longer accepting our mail ...