Postmark is transactional email infrastructure built for inbox placement — separate sending streams for transactional vs. marketing email keep your delivery reputation clean.
Postmark is a transactional email service from Wildbit (now part of ActiveCampaign as of 2022) that has spent over a decade focusing on one thing: making sure receipts, password resets, magic links, account notifications and other one-to-one application messages reach the inbox. The defining choice is policy: Postmark refuses bulk marketing email on its transactional servers, keeping IP reputation tight. The result is consistent inbox placement that benchmarks ahead of SendGrid and Mailgun for transactional traffic.
Sign up, verify a sender domain with SPF and DKIM (DMARC recommended), and start sending via SMTP relay or HTTP API. Postmark separates servers into Transactional and Broadcast, each with its own IP pool and reputation. Templates support handlebars-style variables and a visual editor; a starter library covers standard SaaS messages (welcome, password reset, invoice). Webhooks fire on delivery, bounce, complaint, open and click. Hard bounces suppress automatically; soft bounces retry with backoff. The Activity tab shows every message with full headers and content for debugging.
The free plan ships 100 emails/month forever for development and tiny apps. Paid plans start at $15/month for 10,000 emails, $50/month for 50,000, $115/month for 200,000, scaling to roughly $0.0008 per email at the largest tiers. Dedicated IPs cost $50/month each, recommended above ~300,000/month. Versus SendGrid Pro at $89.95/month for 100,000 emails or Mailgun Foundation at $35/month for 50,000, Postmark is competitive on rate and justifies a small premium with deliverability and the Activity tab. Unused monthly volume does not roll over, so spiky senders pay for headroom.
| Tool | Pricing | Strengths | Weaknesses |
|---|---|---|---|
| Postmark | From $15/mo (10k) | Deliverability, Activity tab | No bulk marketing on transactional servers |
| SendGrid | From $19.95/mo (50k) | Scale, Twilio ecosystem | Shared-IP reputation pollution |
| Mailgun | From $35/mo (50k) | Developer flexibility | Deliverability behind Postmark |
| Amazon SES | $0.10/1k | Cheapest at scale | You handle reputation, no Activity UI |
Buy if: you run a SaaS or ecommerce product where transactional emails are critical to the user experience (password resets, magic links, receipts); deliverability matters more than the absolute lowest per-email price; you want a working dashboard with full message inspection rather than a CLI-only experience.
Skip if: your primary need is bulk marketing or newsletters — Postmark deliberately keeps that off the transactional servers, so use Brevo, Mailchimp or Klaviyo for that; you send tens of millions of emails and the cost differential to Amazon SES outweighs the deliverability gap; you need integrated customer engagement features like in-app messaging and chat — Postmark is pure transactional infrastructure, not a customer-engagement platform.
100 free emails/month forever. Paid plans from $15/month for 10,000 emails, with templates, webhooks and the Activity tab on every plan.
Early-stage teams need password resets, welcome emails, and billing notifications to reach inboxes reliably. Postmark handles bounce management and authentication setup so founders focus on product, not mail infrastructure. No DevOps required.
Platforms sending millions of transactional emails per month use Postmark's API and bounce webhooks to automate address cleanup and suppress invalid recipients. Real-time analytics feed into internal dashboards and alerting systems.
Teams managing subscriptions and recurring billing rely on Postmark to deliver receipts, invoices, and dunning emails without landing in spam. Bounce classification helps identify and flag failed payment notifications before churn increases.
Quarterly access to product leadership.
Bonus credits redeemable on partner tooling.
We re-verify the offer every quarter so it never goes stale.
Hit the button on this page — opens the partner site in a new tab.
Check your investor or accelerator benefits portal for the Postmark partner code. Y Combinator, Sequoia, and most Tier 1 VCs have codes available.
Renewals stay at the same rate — verified by us, not the vendor.
| Feature | Postmark |
|---|---|
| Free trial | 14 days |
| Cheapest paid plan | $0/mo |
| Annual discount | Up to 25% |
| Refund window | 30 days |
| Setup time | < 1 hour |
| Best for | Founders |
“$15/mo for 10K emails is fair for critical infrastructure”
“45-day activity log makes debugging email delivery trivial”
“Switched from SendGrid — inbox placement improved immediately”
