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We use Mailgun which delivers quite fast, but we noticed that some customers, especially the big companies with an IT department running its own email server, tend to have some form of greylisting: if it is the first time they receive an email from our system, then they refuse it temporarily, and ask our system to retry in (for example) 5 minutes. Mailgun manages this nicely, but during those 5 minutes, the user is still waiting his/her magic link.

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Postmark doesn't allow marketing emails, so their reputation scores are better and hence they have better deliverability. That's their main value prop.

I know about this, and about Postmark great deliverability, but the greylisting some companies use is naive and doesn't care about reputation: if you are a new sender, you to have wait 5 minutes and retry, whoever is sending (Postmark or Mailgun).

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