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Great post and thank you for putting this together. You make a great point that email needs to be approached carefully and handled correctly. I would add Postmark to your list of providers since a number of people on the forum (me included) are using it.

In general, what I tried to look for is how “clean” does the email provider try to keep their IPs. If a provider is allowing both marketing and transactional emails to take place over the same IP, and they have lax standards about who they let use their service, then that increases the likelihood the provider’s IPs are abused, resulting in the IP getting blacklisted and your transactional emails getting blocked.

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