Postmark
Reviewed by Alexis Morain · Updated July 11, 2026
Postmark sends transactional emails quickly and with a strong reputation for deliverability, via API or SMTP. Free plan, paid plans from $15/month.
A safe bet for transactional email, known for its deliverability and speed, less suited to marketing and pricier at large volumes.
- Deliverability and delivery speed are well regarded
- Separate transactional and marketing streams
- Built for transactional, marketing is secondary
Postmark is a transactional email service known for its speed and deliverability. Published by Wildbit, now under ActiveCampaign, it focuses on doing one job well: delivering emails triggered by an application quickly and straight to the inbox.
What is Postmark for?
You plug in the API or SMTP relay to send order confirmations, password resets, invoices, and notifications. Postmark separates transactional flows from marketing flows (distinct message streams) to protect sending reputation, provides detailed webhooks (bounces, complaints, opens), and a searchable message history. Its promise is top-tier deliverability and some of the fastest delivery times on the market, making it a favorite among demanding developers.
Postmark or SendGrid and Resend?
Compared to SendGrid, more general-purpose and built for very large mixed volumes, Postmark is more focused on transactional email and its deliverability. Compared to Resend, newer and geared toward a modern developer experience, it relies on its maturity and sending reputation. For critical transactional email, it's a safe bet.
What are the limits of Postmark?
It's not a marketing tool: the campaigns side stays secondary. Volume-based pricing can end up costing more than competitors at very large volumes, and there's no annual discount. The free plan is capped at 100 emails per month.
Pros & Cons
- Deliverability and delivery speed are well regarded
- Separate transactional and marketing streams
- Detailed webhooks and message history
- Permanent free plan, full API included
- Built for transactional, marketing is secondary
- High per-volume cost at large sends
- No annual discount
Key features of Postmark
Transactional API
Emails triggered by the application
Message streams
Separate transactional and marketing flows
Webhooks
Detailed bounces, complaints, and opens
History
Searchable record of sent messages
Postmark pricing
Postmark offers a permanent free plan capped at 100 emails per month. Paid plans start at $15/month for 10,000 emails (Basic), then $16.50 (Pro) and $18 (Platform), all including the same volume but cheaper overage rates. Billing is monthly with no annual discount; a dedicated IP costs $50/month above a certain volume.
Free plan / trial
Permanent free plan: 100 emails per month, with no overage option (sending stops at the limit), and full access to the API and webhooks.
Free
100 emails/month · Full API and webhooks · No overage
$0
Basic
10,000 emails included · Overage $1.80/1,000 · Message history
$15 per month
Pro
10,000 emails included · Overage $1.30/1,000 · Priority support
$16.50 per month
Platform
10,000 emails included · Overage $1.20/1,000 · Extended features
$18 per month
Pricing verified on July 11, 2026
Try PostmarkWho is Postmark for?
Best for
- Critical transactional emails
- Developers demanding on deliverability
- Applications needing reliable, fast sending
Not recommended for
- Large-scale marketing campaigns
- Very high volumes sensitive to cost
Want to try Postmark?
Head to the official site and the current offer.
Frequently asked questions about Postmark
Is Postmark free?▼
Postmark or SendGrid?▼
Does Postmark handle marketing?▼
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