Reliable, fast transactional email delivery for developers
From $15/mo (free plan available)Visit WebsiteThe Bottom Line
- Price
- From $15/mo (free plan available). Compare plans
Key facts
- Transactional email service with sub-second delivery and strict sender vetting
- Separates transactional and promotional email into distinct streams to protect inbox placement
- Offers paid plans with premium support included
Pros
- Sub-second delivery times significantly faster than most competitors
- Message streams separate transactional from promotional to protect deliverability
- Premium support included on all plans at no extra cost
- Generous free tier with 100 emails per month that never expires
- Clean developer-focused API with SDKs for all major languages
- Strong sender vetting process ensures high shared IP reputation
Cons
- Not designed for marketing or newsletter campaigns
- Dedicated IPs require minimum 300,000 emails per month
- Free plan limited to 100 emails which is very low for production use
- Overage pricing can add up quickly at scale without pre-purchasing volume
- No built-in drag-and-drop email builder for non-technical users
What is Postmark?
Available on: Web
Ratings Across the Web
Postmark holds an aggregate rating of 4.7 out of 5 from 67 reviews across G2 and Capterra, last checked September 17, 2026.
Ratings aggregated from independent review platforms. Learn more
Key Features
- Transactional email delivery via REST API and SMTP
- Separate message streams for transactional and promotional email
- Built-in email templates with dynamic variables and layouts
- Inbound email processing and parsing
- Real-time webhooks for bounces, opens, clicks, and deliveries
- Detailed delivery analytics and engagement tracking
- DMARC monitoring and reporting per domain
- Dedicated IP addresses for high-volume senders
- Custom sending domains with DKIM and SPF authentication
- Bulk email API for large-scale batch sending operations
Pricing Plans
Pricing checked Oct 11, 2026
| Plan | Price | Details |
|---|---|---|
| Free | $0 |
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| Basic | $15 |
+3 more Show less
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| Pro | $16.5 |
+3 more Show less
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| Platform | $18 |
+2 more Show less
|
Is Postmark worth the price?
Postmark has built its entire reputation on one thing: deliverability.
While competitors like SendGrid and Mailgun compete on price and volume, Postmark competes on inbox placement, and the data backs it up. They enforce strict content policies (no bulk marketing on transactional streams), maintain a smaller sender pool, and actively remove bad actors, which keeps shared IP reputation high.
The pricing is straightforward: $15-18/month base plus per-email overage, no per-seat charges, no feature tiers that gate essential deliverability features. The gap between Basic ($1.80/1,000) and Platform ($1.20/1,000) is meaningful at scale, a 33% cost reduction per email.
The main limitation is that Postmark is purpose-built for transactional and broadcast email only; it is not a marketing automation platform. No drip campaigns, no visual email builders, no audience segmentation.
If you need those, pair Postmark (transactional) with a dedicated marketing tool.
Hidden Costs & Gotchas
Below that volume, a dedicated IP actually hurts deliverability because the IP lacks enough traffic to build a warm reputation. Most senders under 300k/month are better off on Postmark's shared pool
DMARC monitoring is a paid add-on
$14/month per domain. Many competitors include basic DMARC reporting for free.
Activity retention is short on Basic
only 45 days of message activity retention on Basic. If you need to investigate a delivery issue from 3 months ago on Basic, that data is gone
Broadcast emails count against your quota
Postmark now supports broadcast (marketing-style) emails alongside transactional. Both count against your email volume. A monthly newsletter to 5,000 subscribers eats 50% of your 10,000-email base allocation
No built-in email template builder
Postmark provides basic templates but no drag-and-drop visual editor. You need to bring your own HTML templates or use a third-party builder like Maizzle or MJML. Competitors like Resend and SendGrid include more capable template editors
Overage is billed retroactively
overages are calculated at the end of the billing cycle and charged on the next month's invoice. A traffic spike can create an unexpectedly large bill the following month with no real-time spending cap
Reviews
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Across 67 verified user reviews on Capterra, G2
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Postmark FAQ
How does Postmark ensure high deliverability for transactional emails?
Which teams benefit most from using Postmark?
How is Postmark priced?
Can Postmark be used for marketing or newsletter campaigns?
How does Postmark compare to SendGrid for transactional email?
What kind of integrations does Postmark offer for developers?
Does Postmark support custom sending domains and authentication?
Source: postmarkapp.com