Postmark sends your app's transactional emails, the ones that must arrive: password resets, login links, receipts and alerts. It's for founders running a SaaS or online service who can't afford those emails landing in spam. The free plan sends 100 emails a month with no overages, which is enough to test your integration. Basic starts at $15 a month for 10,000 emails, with extra emails at $1.80 per 1,000.
What it can do for you
Connect by API or SMTP, use its ready-made templates for welcome and reset emails, and see every message in detailed logs kept for 45 days on Basic. Separate message streams keep any bulk mail apart from your critical mail. When a customer says "I never got the email", you can see exactly what happened.
What people like
Comparisons treat Postmark as the benchmark for transactional email. Reviewers praise its deliverability, its fast delivery, its clear documentation and its logs, and say it's the safe choice when emails are business-critical.
The honest downsides
- Free is for testing. 100 emails a month won't run a live app.
- Strict about content. It's for transactional mail. One comparison warns that sending marketing mail through the transactional stream can lead to a warning and then suspension.
- Slower onboarding. One review describes new-account approval taking days, with some accounts declined after setup.
- Support concerns. The same review reports long-term customers saying support has declined since the ActiveCampaign acquisition.
- Pricier at scale than bare-bones senders, according to reviewers.
Skip it if
- you want one tool for newsletters and app emails
- you send very high volumes and have the skills to run a cheaper sender
Alternatives
There's nothing we list that's better for delivering critical app emails.
- Resend has a far more useful free tier (3,000 emails a month) and a modern developer experience.
- Brevo if you want transactional and marketing email in one account.
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