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Surprised he didn't mention third party reputation providers such at Return Path.

I'm surprised as well, since these services reinforce his point even more. In other words, good reputation = $$$.

Also, I currently use mailgun (and dabbling with mandrill on some new projects) but I'm intrigued by postmarkapp.com take on dedicated IP addresses. Apparently they won't sell dedicated IP addresses because of the time needed to warm them up, so you get a shared IP and their TOS is stricter anti-spam than other ESP's: http://blog.postmarkapp.com/post/14127210172/the-false-promi...

Mmm... not really. Dedicated IPs are hard to beat if you have a steady traffic of high quality and low-latency delivery is a priority (think of PagerDuty). Most legit businesses/customers have that. Most likely they're not offering dedicated IPs because they're tough to get, especially if you are a small company in email business.

The reason Mailgun and Mandrill can do this is because they belong to much larger companies with better access to IPv4 stockpiles: Rackspace and Mailchimp.

Source: I worked at Mailgun.

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