Thinking of &quot;email delivery as a commodity&quot; is the first mistake people make - all ESPs are not created equal. If this were the case, there would not be such a huge variance in not only getting to the Inbox, but how fast you get to the Inbox. This is why we&#x27;ve focused on transactional only, knowing fully well we will grow slower as a business (and why we are more expensive), but have superior delivery since transactional email has a much higher engagement rate and reputation with ISPs.<p>The entire idea of &quot;dumb pipe&quot; or &quot;commodity&quot; needs to go away. There is a reason why companies like Asana, Desk, and Minecraft chose Postmark, since their email is critical to their business and choosing the right providers makes a real difference. Now, if your emails are not critical, I can see how any service might work. I have yet to come across a product owner who is comfortable letting their customers wait for their transactional emails though - no matter the size of product or company.<p>Full disclosure, I&#x27;m the founder of Postmark - the best &quot;dumb pipe commodity&quot; money can buy.