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Random comment on Reddit, if it helps: https://www.reddit.com/r/startups/comments/3jnxep/good_riddance_mailchimp_surprisingly_greedy/curewaa/ https://www.reddi

• jtwebman 9y ago
  Thanks that at least covers transactional style emails I would be curious for newsletters and marketing emails as well.
• eli 9y ago
  That seems to conflate speed of sending a double opt-in with deliverability. Ideally you'd want to measure deliverability with something like Return Path.