email
Postmark pricing & features
Reliable transactional email with fast delivery
Transactional email with industry-leading deliverability and speed (sub-10s median). Streams separate marketing vs transactional. Inbound email parsing. 45-365 day retention. Owned by ActiveCampaign.
Data sourced from vendor documentation · Last updated May 2026
Pricing
| Tier | Price | Notes |
|---|---|---|
| Free | Free | 100 emails/month forever. No credit card. Side projects and testing. |
| Basic — 10k | $15/mo | 10,000 emails/month. Overage $1.80/1k. Unlimited emails/day. |
| Pro — 10k | $17/mo | 10,000 emails/month. Overage $1.30/1k. Inbound email + message streams. |
| Platform — 10k | $18/mo | 10,000 emails/month. Overage $1.20/1k. Team collab, more domains. |
| Enterprise (>1.5M) | Custom | Custom for senders exceeding 1.5M/month. |
Limits
| Tier | Metric | Value | Notes |
|---|---|---|---|
| — | delivery speed | <10 seconds median | Industry-leading speed |
| — | dkim spf dmarc | Required for sending + auto-verification | Domain auth |
| — | domains default | 5-10 sending domains (Pro/Platform more) | Sending domains |
| — | inbound parsing | Included on Pro/Platform | Inbound email |
| — | message streams | Separate transactional vs broadcast pipelines | Pro/Platform feature |
| — | owner | ActiveCampaign (acquired 2022) | Ownership |
| — | retention default | 45 days (up to 365 on Pro/Platform) | Message retention |
Features
- Activity Search — Full-text search over sent messages for 45-365 days.
- Bounce Handling — Automatic hard/soft bounce detection + suppression management.
- Broadcast Messages — Via separate Broadcast Message Stream. Bulk sends with throttling.
- DKIM + SPF — One-click verification + auto-renewal of DKIM keys.
- Inbound Email — Route inbound emails to your webhook. Parse attachments, threads.
- Message Streams — Isolate transactional from marketing for separate deliverability reputation. · docs
- Open + Click Tracking — Configurable at template or send level.
- Raw API Access — 100+ endpoints for bounces, servers, tags, templates, stats.
- Servers — Multi-tenant isolation: each "server" has its own API token + reputation.
- Templates — Mustachio template language with variables, alias + versioning. · docs
- Transactional Send — Reliable API for password resets, receipts, notifications. Sub-10s delivery.
- Webhook Events — Delivery, bounce, spam complaint, open, click, subscription change.
Developer interfaces
| Slug | Name | Kind | Version |
|---|---|---|---|
| inbound | Inbound Email | other | — |
| rest-api | Postmark REST API | rest | v1 |
| smtp | SMTP Relay | other | — |
| webhooks | Webhooks | other | — |
| sdk-node | postmark (Node) | sdk | 4.x |
| sdk-dotnet | postmark-dotnet | sdk | 4.x |
| sdk-go | postmark-go | sdk | 1.x |
| sdk-php | postmark-php | sdk | 5.x |
| sdk-ruby | postmark-rails | sdk | 0.x |
| sdk-python | postmarker (Python) | sdk | 1.x |
Related email platforms
email
Loops
Email marketing for SaaS — loops, transactional, campaigns in one
email
Mailgun
Email API for developers with deep deliverability tooling
email
Resend
The email API for developers — built by the Nodemailer team
email
SendGrid (Twilio)
Legacy email infrastructure at scale — 100B+ emails/year
Compare Postmark with
email
Postmark vs Loops
Side-by-side breakdown.
email
Postmark vs Mailgun
Side-by-side breakdown.
email
Postmark vs Resend
Side-by-side breakdown.
email
Postmark vs SendGrid (Twilio)
Side-by-side breakdown.
ai-api
Postmark vs Anthropic API
Side-by-side breakdown.
ai-api
Postmark vs AssemblyAI
Side-by-side breakdown.
ai-api
Postmark vs Deepgram
Side-by-side breakdown.
ai-api
Postmark vs ElevenLabs
Side-by-side breakdown.
ai-api
Postmark vs Google Gemini API
Side-by-side breakdown.
ai-api
Postmark vs Groq
Side-by-side breakdown.
ai-api
Postmark vs OpenAI API
Side-by-side breakdown.
ai-api
Postmark vs Replicate
Side-by-side breakdown.
Staxly is an independent catalog of developer platforms. The link to Postmark above may be an affiliate link — Staxly may earn a commission if you sign up through it, at no extra cost to you. Pricing is verified at publication time — reconfirm on the vendor site before buying.