vioscale
Communication APIsUnclaimed

Postmark

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Also known as
postmark

Available worldwide · Popular in: US

What is Postmark?

Transactional email delivery service with fast, reliable SMTP and REST API. Includes email templates, analytics, webhooks, inbound email processing, and per-unit overage pricing.

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
-
Delivery
Email deliverability tools
✓
Commercial
Published per-unit pricing
✓
Independently observed

Platform & deployment

Independently observed
Platforms
  • CLI
  • Web
Deployment
  • Cloud / SaaS

Postmark alternatives

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

Independent · unbought · dated

The Vioscale 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 67 / 100
low · 29%
Signal contributions to the composite score
SignalScoreWeightContributionEvidence
Reliability500.178.8✓
Pricing Transparency1000.077.0✓
Capabilities670.074.7✓
Price Level800.053.8✓
Integrations00.090.0-
Security Posture50.130.0-

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.

Features

AttributeValueEvidence
Capabilities{"email":true,"two_way":true,"deliverability_tools":true,"usage_pricing_transparent":true}mediumsource · 2026-08-05 · 60%

Market

AttributeValueEvidence
Availability{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}mediumsource · 2026-08-05 · 50%

Pricing

AttributeValueEvidence
Free tierYesmediumsource · 2026-08-05 · 60%
Modelcommercialmediumsource · 2026-08-05 · 60%
Price levellowmediumsource · 2026-08-05 · 60%
Starting gbp1.2mediumsource · 2026-08-05 · 60%
TransparentYesmediumsource · 2026-08-05 · 60%

Reliability

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

Security

AttributeValueEvidence
GdprYeshighsource · 2026-08-05 · 75%