If you are using PowerDNS for round robin on multiple websites, you can set it up so that it will return only the records for sites that are up. I set up a Ruby daemon to monitor sites and connect to the PowerDNS MySQL table used by PowerDNS on Rails. You can use any language or system you like. It just needs to be able to access your PowerDNS database. Read the rest of this entry »
Just used up my morning trying to resolve an MX record problem. We were not getting our email through our new Google Apps account. I tried to send from Gmail to myself and it worked. I tried to send to someone else in our domain, and got a “550 550 Unrouteable address (state 14)” error.