Today we finally solved our email mystery. The reason some people could not get their email from their homes was that they were using Comcast as a service provider.

Querying Comcast’s DNS servers at 75.75.75.75 and 75.75.76.76, we discovered that our domain won’t resolve there at all, and even with the domains that do resolve properly there’s between 20% and 50% packet losses. Comcast’s DNS is broken.

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We’re a Comcast Business Internet customer, and the people failing to communicate with our site are Comcast Home Internet customers (typically “Triple play” buyers) so this is a case where they are actually failing to provide a critically important customer service to both sides of their business. Our users who have Verizon FIOS are working fine, despite Verizon’s long standing practice of unethical DNS hijacking.