color-geographicfeature-orgdesignation is their name generator, at least.
None of the the domains listed in this thread appear to be taken (the site uses godaddy to verify, and is updated every 24h), but there are others in this scheme that may be related.
Obviously they're not literally all the color+feature+company pattern but I don't think they're just reusing old "real" domains either.
As for not getting spam filtered, using a big pile of new domains with no web presence probably has the reverse effect so I don't think that's the intention here. Also I think as it's described, these emails aren't really sending messages to people, they're there to receive emails from Ticketmaster or similar entities when you go to transfer though them.