Postmark

Transactional email service focused on fast delivery, with simple volume-based plans.

Free plan + paidTransactional email services

Updated Nov 6, 2026 · AppBreakup editorial · Web

Visit Postmark See 8 alternatives

Is Postmark free?

Free plan, plus paid plans

Starting price:: $15 a month (Basic, 10,000 emails)
Free plan:: Yes, 100 emails a month

Checked on Postmark's site Nov 8, 2026

Full Postmark pricing and plans

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Twilio SendGrid
Paid
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Mailgun
Starting paid plan: $35/month for 50,000 emails
Resend
Starting price: $20 a month for 50,000 emails (Pro)

Verified facts: 6 of 6
Alternatives ranked: 8
Approved reviews: 0
Visits sent from here: 0

About Postmark

Postmark is an email sending service built mainly for transactional messages: password resets, receipts, sign-in links and notifications that users expect within seconds. It keeps those separate from bulk mail using message streams, so marketing sends don't drag down the reputation of critical email, and it now offers a separate bulk API for broadcasts. Developers send through a REST API or SMTP, use server-side templates, process inbound email into JSON webhooks, and search detailed activity logs kept for 45 days by default or longer on higher plans. Pricing is published and simple: a free developer plan with 100 emails a month for testing, then monthly tiers based on volume with per-thousand overage and unlimited daily sending. It is a hosted service with libraries for common languages. Postmark suits SaaS products and startups that care most about delivery speed and clear logs; teams that mainly send newsletters will find it less suited than a marketing-first tool.

Best for: SaaS teams that care most about fast, reliable delivery of password resets and receipts.

Postmark pricing (checked Nov 8, 2026)

Each line is quoted from Postmark's own site, with the page it came from.

Plan or term	What it says	Checked	Source
Free plan	Yes, 100 emails a month	Nov 8, 2026	postmarkapp.com
Starting price	$15 a month (Basic, 10,000 emails)	Nov 8, 2026	postmarkapp.com
Pro plan	$16.50 a month (10,000 emails)	Nov 8, 2026	postmarkapp.com
Platform plan	$18 a month (10,000 emails)	Nov 8, 2026	postmarkapp.com

Full Postmark pricing and cheaper alternatives

What works

Transactional and bulk mail kept in separate streams
Clear published pricing with unlimited daily sending
Inbound email processing on the Pro tier and above
Searchable activity logs with adjustable retention

Why people leave

Free plan allows only 100 emails a month
Less suited to large marketing newsletters
Fewer custom sending domains on the cheapest plan

Postmark vs Twilio SendGrid, Mailgun and Resend

From each app's listing and the prices verified on its own site. A dash means we haven't verified it yet.

Attribute	Postmark	Twilio SendGrid	Mailgun	Resend
Pricing	Free plan + paid	Paid	Free plan + paid	Free plan + paid
Verified price	$15 a month (Basic, 10,000 emails)	—	$35/month for 50,000 emails	$20 a month for 50,000 emails (Pro)
Free plan	Yes, 100 emails a month	No	Yes, 100 emails/day	Yes, 3,000 emails a month (100 a day)
Open source	No	No	No	No
Self-hostable	No	No	No	No
Platforms	Web	Web	Web	Web

Full Postmark vs Twilio SendGrid comparison

Why people left Postmark

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

No switching stories yet. If you moved away from Postmark, review the app you switched to and tell us why.

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Postmark: common questions

What is Postmark?

Postmark: Transactional email service focused on fast delivery, with simple volume-based plans. Best for saaS teams that care most about fast, reliable delivery of password resets and receipts. Available for Web.

Is Postmark free?

Postmark has a free plan and paid plans. Free plan: Yes, 100 emails a month (checked on Postmark's own site).

How much does Postmark cost?

Postmark is free with paid plans. Free plan: Yes, 100 emails a month; Starting price: $15 a month (Basic, 10,000 emails); Pro plan: $16.50 a month (10,000 emails); Platform plan: $18 a month (10,000 emails). Checked on Postmark's own site, November 2026.

Is Postmark open source?

No, Postmark is not open source.

What platforms does Postmark run on?

Postmark is available for Web.

What are the best alternatives to Postmark?

The highest-ranked Postmark alternatives right now are Twilio SendGrid, Mailgun and Resend. See the full ranked list for pricing, platforms and verified facts.

Postmark vs Twilio SendGrid: what's the difference?

Postmark is free with paid plans; Twilio SendGrid is a paid product. Both run on Web.

See all 8 Postmark alternatives

Postmark facts

6 of 6 verified

Free plan: Yes, 100 emails a month; Checked Nov 8, 2026postmarkapp.com(opens source in a new tab); “10,000 emails Free $0.00 /mo Test your integration with 100 emails/month 100 emails/month.”
Starting price: $15 a month (Basic, 10,000 emails); Checked Nov 8, 2026postmarkapp.com(opens source in a new tab); “Basic $15.00 /mo For solo developers and smaller teams Starting at 10,000 emails/month.”
Data retention: 45 days default, up to 365; Checked Nov 8, 2026postmarkapp.com(opens source in a new tab); “Customizable data retention up to 365 days (45-day default)”
Daily limit: Unlimited emails/day on paid plans; Checked Nov 8, 2026postmarkapp.com(opens source in a new tab); “Unlimited emails/day Detailed analytics and insights Buy Now Most Popular!”
Pro plan: $16.50 a month (10,000 emails); Checked Nov 8, 2026postmarkapp.com(opens source in a new tab); “Pro $16.50 /mo For start-ups and small businesses Starting at 10,000 emails/month.”
Platform plan: $18 a month (10,000 emails); Checked Nov 8, 2026postmarkapp.com(opens source in a new tab); “Platform $18.00 /mo For agencies and larger teams Starting at 10,000 emails/month.”