Field notes on AI-era growth, deliverability, voice, and messaging for developers and teams building on Orbit by Devotel.
Resend vs Postmark head-to-head: the posture split, a row battery on published pricing and docs (per-1k rates, retention, inbound, suppression, templates, SDKs, support), honest placement for each vendor, and a decision tree for dev teams.
The tri-corner comparison closed with a dangling 'fourth corner' of smaller providers. This post closes that loop: a registry recap of the published-vs-published benchmarks, break-even math with no invented numbers, the same parity-honesty contract as the three sister posts, a walked decision tree, a buyer-run verification checklist, and honest placement for each vendor — including where Orbit loses.
Stack-dismantling series: Mailgun, Postmark, and SendGrid all ship transactional email APIs — but they differ on deliverability posture, marketing bundle, and pricing tier. A sourced three-corner comparison for teams shortlisting an email API.
Orbit vs Postmark: honest cells from /compare/postmark, what Postmark's transactional-only specialization buys, migration framing for a template-payload move, and when the incumbent still wins.
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