29 Aug '11, 2pm

Behind The Scenes with ReverseMX

At DomainTools, we often throw around ideas on new and interesting data we could collect and combine with our existing data sets to discover interesting information. One idea that had been floating around was to look up and store mail server (MX) records for all domain names we know of in the popular top level domains (TLDs). This would enable us to find relationships between domains that share mail servers, show mail server host names which resolve to the same IP address, and compare numbers of domains which use hosted mail services like Google Apps for Domains and Microsoft’s Exchange Online. In addition to MX data, we also wanted to crawl TXT records of domains to collect SPF rules. We think SPF rules are a good idea, but since they are optional, it’s interesting to know how many domains elect to use them. For example, we can now see how many domains hosted on Google’s ...

Full article: http://blog.domaintools.com/2011/08/behind-the-scenes-wit...

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