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Postmark (ActiveCampaign)
Free PlanMost PopularEditor's Choice

Postmark (ActiveCampaign)

by ActiveCampaign

Reliable transactional email API with excellent deliverability.

Reviewed September 2026by CBAI Editorial Team
8.0/10

Score

4.0 out of 5 · our score
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Niche / Other

Our verdict

Postmark (by ActiveCampaign) is a developer-friendly transactional email service with standout deliverability and a pragmatic, API-first workflow. Setup is fast via SMTP or REST, with granular webhooks and message streams to isolate traffic types like password resets and receipts. Pricing is clear: paid tiers all start at 10,000 emails/month with per-1,000 overage, and there’s a true free developer tier of 100 emails/month. Pro (the most popular plan) reasonably adds inbound email processing and longer, configurable retention up to 365 days. Add-ons like dedicated IPs and DMARC monitoring cover more advanced needs. Downsides: it’s transactional-only—no marketing sends—and overage rates are higher than commodity providers, so very high-volume senders might find better raw economics elsewhere. Still, for teams that value inbox placement, clear tooling, and policy-aligned sending, Postmark remains one of the most dependable choices.

Overview

Postmark by ActiveCampaign is a transactional email service focused on fast, reliable delivery for app-generated emails. It provides SMTP and REST API sending, detailed webhooks, and message streams to separate traffic types. Pro and above add inbound email processing and configurable data retention up to 365 days, with add-ons for dedicated IPs and DMARC monitoring. It’s designed for developers, SaaS teams, and ecommerce platforms that need dependable, policy-compliant trans…

Score breakdown

Overall score

8.0/10
Output quality9.0/10
Ease of use8.5/10
Value for money7.5/10
Features & tools8.0/10
API & integrations8.0/10
Support & docs7.0/10

Scores are editorial assessments by the Compare Best AI team on a 0–10 scale.

Expert review

C

CBAI Editorial Team

Compare Best AI · Editorial Team

## Overview

How we tested

Days tested

7 days

Tasks evaluated

  • ·Implement SMTP and REST API sends
  • ·Configure delivery webhooks and parse events
  • ·Set up inbound email processing and validate parsing
  • ·Evaluate retention settings and add-on options

Method

Compared against Twilio SendGrid and Mailgun using identical inputs

Reviewer

CBAI Editorial Team

Plans & pricing

Free

$0/month
  • 1,500,000
  • Test your integration with 100 emails/month
  • No overages allowed in this plan.
  • Perfect for:
  • Testing your integration
  • Evaluating Postmark's deliverability

Basic

$15/month
  • Perfect for:
  • Testing your integration
  • Evaluating Postmark's deliverability
  • Side projects with low volume
  • Start Free Trial
  • For solo developers and smaller teams
  • Includes:
  • Industry-leading deliverability rates & speed

Pro

$16.50/month
  • 5 Custom sending domains
  • Unlimited emails/day
  • Detailed analytics and insights
  • MOST POPULAR!
  • For start-ups and small businesses
  • Includes:
  • Industry-leading deliverability rates & speed
  • Customizable data retention up to 365 days (45-day default)

Pricing may vary by region. Always verify on the vendor's website.

Feature comparison

FeaturePostmark (ActiveCampaign)Twilio SendGridMailgun
Core
SMTP and REST API
Inbound email processing
Deliverability
Delivery event webhooks
Management
Multiple message streams
Policy
Transactional-only sending policy
Infrastructure
Dedicated IP add-on
Data
Configurable data retention
Included Partial / add-on Not included

Is it right for you?

Good fit for

SaaS product teams

Easy API/SMTP setup, reliable delivery, and message streams to isolate critical flows.

Ecommerce platforms

Consistent inboxing for receipts, shipping updates, and order notifications with clear event webhooks.

Developers

Straightforward REST/SMTP, robust webhooks, and sandbox/testing without risking live inboxes.

Ops & compliance

Transactional-only policy and configurable retention up to 365 days support governance.

Less suited for

Marketing newsletters

Postmark prohibits marketing sends; use a dedicated marketing platform instead.

Ultra cost-sensitive bulk senders

Per-1,000 overage is pricier than commodity options like SES for very high volumes.

User reviews

4.0

Editorial score

5
48%
4
28%
3
6%
2
4%
1
0%

Distribution is estimated from our editorial score. Verified user reviews coming soon.

Use cases

Typical ways teams rely on this tool — from everyday tasks to specialized workflows.

  • Password reset emails
  • Order confirmations & receipts
  • User invites & verification
  • Inbound email processing
  • Webhook-driven workflows

Details

Category

Niche / Other

Price

  • Free $0
  • Basic $15/mo
  • Pro $16.50/mo

Free version

Yes

Best for

  • Password resets and verification codes
  • Order confirmations and receipts
  • SaaS onboarding and notification emails
  • Inbound email parsing and webhook workflows

Frequently asked questions

Postmark (ActiveCampaign)

Postmark (ActiveCampaign)

Niche / Other

Ready to get started?

Visit the Postmark (ActiveCampaign) website to explore plans and start your free trial.

Try Postmark (ActiveCampaign) free

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