vioscaleAI
Communication APIsUnclaimed

Postmark

Transactional email delivery service with SMTP and API support

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Also known as
postmark

Available worldwide

What is Postmark?

A service for reliably sending transactional emails from applications using REST API or SMTP, with libraries available for multiple programming languages.

Independently observed

Postmark pricing

Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.

Pricing as of verify at live pricing ↗Independently observed
from $1.20/moSubscriptionFree tier

From $15/mo. Free tier with 100 emails/month. Pay-as-you-go overages starting at $1.80 per 1,000 emails.

Free

Free
Free

For testing and evaluation

emails
100/mo
  • 100 emails/month
  • REST API
  • SMTP
  • Transactional email
  • Sandbox Mode
  • Up to 10 custom domains
  • 45-day retention
  • Up to 10 users

Basic

$15/mo + $1.80 per 1,000 overage emails

For solo developers and smaller teams

emails
10,000/mo
  • 10,000+ emails/month
  • Industry-leading deliverability
  • 45-day retention
  • 5 custom domains
  • Unlimited emails/day
  • Detailed analytics
  • Up to 4 users
  • Up to 15 message streams

Pro

$16.50/mo + $1.30 per 1,000 overage emails

For startups and small businesses

emails
10,000/mo
  • 10,000+ emails/month
  • Industry-leading deliverability
  • Customizable retention up to 365 days
  • 10 custom domains
  • Unlimited emails/day
  • Inbound email processing
  • Bulk Email API
  • Detailed analytics
  • Up to 6 users
  • Up to 30 message streams

Platform

$18/mo + $1.20 per 1,000 overage emails

For agencies and larger teams

emails
10,000/mo
  • 10,000+ emails/month
  • Industry-leading deliverability
  • Customizable retention up to 365 days
  • Unlimited custom domains
  • Unlimited emails/day
  • Inbound email processing
  • Bulk Email API
  • Detailed analytics
  • Unlimited users
  • Unlimited message streams

Add-ons

  • Dedicated IPs$50/mo
  • Custom activity retention$5/mo

What Postmark does

The capabilities that matter for communication apis, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.

Channels
SMS
-
Voice
-
WhatsApp
-
RCS
-
Transactional email
✓
Video / real-time
-
In-app chat
-
Verify / OTP / 2FA
-
Messaging
Two-way messaging
✓
Reach
Geographic coverage
Global
Delivery
Email deliverability tools
✓
Commercial
Published per-unit pricing
✓
Independently observed

Platform & deployment

Independently observed
Platforms
  • Web
Deployment
  • Cloud / SaaS

Integrations (22)

Independently observed
  • Mailcoach
  • Datadog
  • Craft CMS
  • Customer.io
  • ActiveCampaign
  • Supabase
  • Bubble
  • Figma
  • Google Sheets
  • Gravity Forms
  • Gravity SMTP for WordPress
  • Netlify
  • Slack
  • Stripe
  • Stripo
  • Typeform
  • WordPress
  • WP Mail SMTP
  • Zapier
  • Tabular
  • SureTriggers
  • Marka Email Generator

Postmark FAQ

Common questions about Postmark, answered from independent, dated evidence.

What is Postmark?

A service for reliably sending transactional emails from applications using REST API or SMTP, with libraries available for multiple programming languages. It is indexed under Communication APIs.

Source: https://postmarkapp.com

Is Postmark free?

Postmark offers a free tier, so you can start without paying. Paid plans start at $1.20. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.

Source: https://postmarkapp.com

What platforms does Postmark support?

We have confirmed browser-based access to Postmark. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.

Source: https://postmarkapp.com

Can Postmark be self-hosted?

We have only confirmed a cloud / SaaS deployment for Postmark, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.

Source: https://postmarkapp.com/blog/announcing-lower-pricing-and-monthly-plans

What does Postmark integrate with?

We have confirmed 21 integrations for Postmark, including Mailcoach, Datadog, Craft CMS, Customer.io, ActiveCampaign, Supabase, Bubble and Figma, plus 13 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.

Source: https://postmarkapp.com/blog/announcing-lower-pricing-and-monthly-plans

What security certifications does Postmark have?

We have independently confirmed GDPR for Postmark. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Postmark not holding them. Always confirm compliance directly before you rely on it.

Source: https://postmarkapp.com/eu-privacy

Where is Postmark available?

Postmark is available worldwide. The vendor is headquartered in the United States.

Source: https://postmarkapp.com/blog/announcing-lower-pricing-and-monthly-plans

Postmark alternatives

Other communication apis we track, ranked by the same independent score.

All Postmark alternatives, ranked →

Compare Postmark

Side by side against other communication apis, attribute by attribute, with a source on every value.

Independent · unbought · dated

The vioscaleAI score: one lens on the evidence

Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Postmark, not the verdict.

Balanced composite 60 / 100
low · 49%
Signal contributions to the composite score
SignalScoreWeightContributionEvidence
Reliability500.167.9✓
Pricing transparency1000.066.3✓
Price level800.043.4✓
Capabilities670.053.4✓
Integrations390.051.9✓
Security posture50.120.0-

Computed . Re-weight it by intent, or see the full method.

All data & sourcesshow ↓

Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.

Content

AttributeValueEvidence
Faq7 itemsmediumsource · 2026-09-10 · 64%

Features

AttributeValueEvidence
CapabilitiesEmail: Yes · Two way: Yes · Global coverage: global · Deliverability tools: Yes · Usage pricing transparent: Yesmediumsource · 2026-09-04 · 60%

Integrations

AttributeValueEvidence
Count22mediumsource · 2026-08-14 · 60%

Market

AttributeValueEvidence
AvailabilityHqCountry: US · PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: …highsource · 2026-08-14 · 75%

Pricing

AttributeValueEvidence
Free tierYesmediumsource · 2026-08-14 · 60%
Modelfreemiummediumsource · 2026-08-14 · 60%
Price levellowmediumsource · 2026-08-14 · 60%
TransparentYesmediumsource · 2026-08-14 · 60%

Reliability

AttributeValueEvidence
Status pageYesmediumsource · 2026-08-05 · 60%

Security

AttributeValueEvidence
GdprYeshighsource · 2026-08-14 · 75%
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