Fast, clean transactional email sending built for developers, not for designing marketing campaigns yourself.
What it does
Postmark is a transactional email service, meaning it specializes in the receipts, password resets, order updates, and account notifications that software sends automatically rather than the newsletters a marketer designs by hand. It was acquired by ActiveCampaign in 2022 and still runs as its own product with its own API and dashboard. Its reputation rests on speed and inbox placement. Postmark separates transactional traffic from bulk marketing traffic on its sending infrastructure as a matter of policy, which keeps delivery times fast and protects sender reputation, and its message-level activity log makes debugging a missing email far easier than most competitors. It is deliberately narrow. There is no drag and drop campaign builder, no list segmentation, and no marketing automation flows, so a business still needs a separate email marketing tool for anything customer-facing and promotional. Pricing also moved in 2026 from pure volume tiers to named plans, so exact cost per 10,000 emails is worth reconfirming before quoting.
Who this helps
● A dev team building a client's app that needs order confirmations and login emails to land reliably in the inbox. ● An agency troubleshooting deliverability complaints where a client's transactional emails from another provider are landing in spam. ● A SaaS founder who wants a clean activity log to quickly confirm whether a specific email was sent, opened, or bounced. ● Not a fit for anyone wanting to design and send a promotional email campaign, that needs a different tool entirely.
Free tier
The free plan sends up to 100 emails per month indefinitely with no card required. Paid plans scale from 10,000 emails per month. Pricing restructured in 2026 — confirm current overage rates before recommending to a client on a tight budget.
At a glance
Pricing
Free tier available
Difficulty
Advanced
Our coverage
Listed
Listed for completeness, not yet reviewed.
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