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Postmark alternative for transactional email
Postmark-class job: transactional mail that has to land. SuperSend TX gives you a modern API on infrastructure we operate, with Pool and Dedicated tiers.
- Isolated transactional email
- POST /emails
- Owned Pool · Dedicated
At a glance
Transactional focus, modern DX, owned pipe
Both products take critical mail seriously. SuperSend TX pairs that focus with npm + curl ergonomics and a clear path to Dedicated servers.
| Attribute | Postmark | SuperSend TX |
|---|---|---|
| Focus | Transactional | Isolated transactional infrastructure |
| API | POST /email | POST /emails |
| Auth | Server token | Bearer stx_… |
| Infra story | Postmark-operated | Owned transactional network; Dedicated available |
| Entry paid plan | Postmark plans | Pro from $20/mo · Scale volume slider |
Why teams look here
Short path to first production send
Keep transactional mail off cold reputation, with a volume ladder that is easy to explain to finance.
SDK + curl DX
Official SDKs in five languages, a CLI, and a flat POST /emails body so engineering can cut over without a redesign.
Clear volume ladder
Free → Pro → Scale with a transparent overage curve — Dedicated when isolation matters more than volume.
Ops that know mail
From the team behind SuperSend outbound — transactional stays on its own reputation surface.
Dedicated when needed
Managed servers and IPs for your workspace. Same API as Pool — no rewrite when you isolate.
Migration
Map fields and cut over webhooks
Postmark tokens become stx_ keys. Payloads flatten. Event handlers re-subscribe to signed SuperSend TX webhooks.
- 1
Create a key
Issue a Bearer stx_… key and verify the domain you send from.
- 2
Swap the client
Point HTTP or the supersendtx SDK at api.supersendtx.com.
- 3
Map fields
Use the Postmark migration guide for field mapping.
- 4
Reconnect webhooks
Subscribe to delivered, bounced, complained, and the rest with whsec_… signing.
- Transactional Pool — marketing never shares the same pipe
- Inbound, templates, automations, SMTP, SDKs, CLI, and MCP included
- Dedicated servers and listed IPs when compliance asks for isolation
SuperSend TX is now Ranla
Same critical transactional email on the same infrastructure — signup and pricing live on ranla.ai, with an AI growth marketer included.
FAQ
Postmark migration FAQ
Is SuperSend TX a Postmark alternative?
Yes — for transactional email. SuperSend TX replaces Postmark’s send path with POST /emails, Bearer stx_ keys, and Pool or Dedicated infrastructure we operate. Compare field-by-field on the Postmark compare page and migration guide rather than treating the products as identical clones.
How do I migrate from Postmark to SuperSend TX?
Create a stx_ API key, verify your domain DNS, map Postmark send fields to POST /emails, and repoint webhooks. The Postmark migration guide covers server tokens, templates, and inbound.
What should I evaluate when choosing a Postmark alternative?
Score who operates the mail servers, who else shares the IPs, what trial traffic shares with production, how flat the send API is, and what Dedicated actually includes. Feature checklists converge among transactional specialists — infrastructure and ops depth do not. See the Postmark alternatives Learn guide for the full framework.
Does SuperSend TX support templates like Postmark?
Yes. A visual block editor with versioned publish and {{variables}} in the dashboard. Send by alias from any SDK. React Email and CLI push cover code-first workflows.
Is inbound email supported?
Yes. Enable inbound on a domain, set MX records, and subscribe to email.received webhooks or inspect mail in the Inbound dashboard.
When should I choose Dedicated over Pool?
Pool covers most transactional volume. Dedicated is for teams that need their own mail servers and IPs for compliance, allowlists, or reputation isolation.
How hard is a Postmark cutover?
The API swap is usually hours. DNS authentication, suppression import, webhook re-pointing, template rebuilds, and a multi-week volume ramp dominate the calendar. Parallel-run old and new during the ramp rather than a hard cutover on day one.