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Postmark logo

Postmark Pricing

postmarkapp.com · Transactional Email · refreshed 2026-05-06
Transactional Email
Free tier
Self-serve checkout
5 tiers
Public API
Quick answer

Postmark pricing starts at $15/mo for the Basic plan. 4 tiers total including a free tier.

Page fetched 2026-05-09 · postmarkapp.com · Tier-based subscription
Postmark pricing page screenshot — https://postmarkapp.com/pricing
Source · live pricing page on 2026-05-06

postmarkapp.com/pricing

Open
Pricing
Postmark pricing
As of 2026-05-09 · postmarkapp.com/pricing
Free
Free
100 emails/month
No overages
Never expires
Basic
$15/mo
flat
Industry-leading deliverability
45‑day data retention
5 custom sending domains
Unlimited emails/day
Detailed analytics
Pro
$16.5/mo
flat
Customizable data retention up to 365 days
10 custom sending domains
Inbound email processing
Industry-leading deliverability
Detailed analytics
Platform
$18/mo
flat
Unlimited custom sending domains
Unlimited users
Industry-leading deliverability
Detailed analytics
Inbound email processing
Cost calculator
See your real cost on each plan

Adjust seats to compare Postmark plans side-by-side and check the annual break-even.

Basic
$15.00/mo
$15.00/mo
Pro
$16.50/mo
$16.50/mo
Platform
$18.00/mo
$18.00/mo
Open live pricing pageSee agent-readiness analysis
Frequently asked
Postmark pricing FAQ

Postmark pricing starts at $0/mo for the Free plan; paid plans range from $15/mo for Basic to $18/mo for Platform. Billed monthly.

Postmark's cheapest business-usable plan is Basic at $15/mo. Lowest paid tier that allows unlimited emails/day and custom domains.

Yes — Postmark publishes a free tier. 100 emails per month, never expires.

Yes — Postmark's purchase motion is self-serve. A checkout URL is published on the pricing page. No demo is required.

xpay scored Postmark as agent-ready: every advertised plan is self-serve with public pricing. Postmark publishes a pricing page with 5 discoverable plan tier(s). Per-unit pricing is published — an agent can forecast cost per task before committing. Self-serve signup exists alongside a sales-led / custom tier. Public API documentation is reachable without an auth wall. A free or freemium tier is offered. For the full purchase simulation see the linked Agent-Ready Index scorecard.

In the Transactional Email category, xpay's Agent-Ready Index lists alternatives ranked by their ability to support AI agent purchase. Visit the agent-readiness scorecard for Postmark to compare with 3 nearest peers.

Alternatives in Transactional Email
Top Postmark alternatives by pricing transparency
Mailgun pricing
mailgun.com
Amazon SES pricing
aws.amazon.com
Mailchimp Transactional Email pricing
mailchimp.com
UniOne pricing
unione.io
AhaSend pricing
ahasend.com
Zoho ZeptoMail pricing
zoho.com
Aritic Mail pricing
aritic.com
Sweego pricing
sweego.io
Browse all Transactional Email alternatives →
AI agent readiness
Can an AI agent buy from Postmark?
Agent-Ready Verified

82

/ 100 in xpay's Agent-Ready SaaS Index

Postmark scores 82/100 on xpay's Agent-Ready Index v2: partial pricing visibility; self-serve checkout is available; a public API exists with documentation; usage-based / per-token pricing is publishe…

See the full scorecardIncludes the 6-step agent purchase simulation, score breakdown across 7 dimensions, and the one-line fix that would lift Postmark into the Agent-Ready Verified band.
Quick facts
At a glance
Free access

100 emails per month, never expires

Billing cycle

Monthly

Lowest paid

$15/mo

Self-serve checkout

3 tiers

Tier count

4

Pricing model

Tier-based subscription

More Transactional Email alternatives
Most agent-ready

Doppler Relay

dopplerrelay.com
65

SMTP2GO

smtp2go.com
64

Kingmailer

kingmailer.co
59

SMTP

smtp.com
56

SocketLabs

socketlabs.com
50
Postmark pricing summary derived from a live read of https://postmarkapp.com/pricing on 2026-05-06. For the agent-readiness assessment — including the 6-step purchase simulation and a per-dimension scorecard — see xpay's Agent-Ready SaaS Index entry for Postmark.

Explore SaaS pricing across categories

25,480+ SaaS scored on agent-buyability — browse by readiness band, category, or jump straight to a pay-per-run tool on xpay.tools.

Browse by category
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Available pay-per-run on xpay.tools
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