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They are. I had to unsubscribe and send three emails to their representatives before they stopped sending me emails.

Same thoughts here. They use fairly aggressive email marketing, which is difficult to unsubscribe to.

I clicked the 'unsub' link in the footer of this particular marketing email and hit: 1) an SSL warning from Chrome, and 2) a 404 on accepting the SSL warning.

hmm, I was able to unsub just fine. Did you try again just incase it was a hiccup with their servers?

Doh! I'll check that out. I'm New Relic's Director of Product Management and work closely with the marketing team. Apologies.

The word you're looking for is: "communicative." Seriously, for a relatively new company, they've done a great job of getting the word out about their stellar product.