Product
Everything you need for critical transactional email
Own the infrastructure with Pool or Dedicated, then ship on a full developer platform: send and receive, webhooks, templates, automations, SMTP, SDKs, CLI, and MCP.
- Free production after domain + card
- Verified domains with one-click DNS
- Node · Python · PHP · Ruby · Go
- Free → Dedicated, same API
Deep dives
The surfaces teams ask about most
Dedicated pages for the capabilities teams ask about most. Everything else is catalogued below with links into the docs.
Inbound email
Receive mail on your domain and drive reply workflows from webhooks or the API.
Templates
Visual editor with versioned publish. Teammates edit in the dashboard; engineers send by alias.
Automations
Turn product events into multi-step transactional email flows.
SMTP relay
Keep SMTP clients; get SuperSend TX domains, billing, and suppressions.
MCP & agents
Hosted MCP, OAuth, and Agent Skills so agents can send and operate safely.
Send
One endpoint for mail that has to arrive
POST /emails covers receipts, resets, alerts, and digests. Batch, schedule, resend, and idempotency are built in — not add-ons.
Batch
Up to 100
per request
Schedule
Native
send · update · cancel
Idempotency
Built in
safe retries
Attachments
Up to 10
per message
Example send
curl -X POST https://api.supersendtx.com/emails \
-H "Authorization: Bearer stx_…" \
-H "Content-Type: application/json" \
-d '{
"from": "[email protected]",
"to": "[email protected]",
"subject": "Your receipt",
"html": "<p>Thanks for your order.</p>"
}'- · SDKs: Node, Python, PHP, Ruby, Go (+ Laravel)
- · tx.emails.send({ … }) in every language
- · CLI: npx -y --package=supersendtx-cli -- supersendtx emails send
- · SMTP: smtp.supersendtx.com:587
Platform
Send
Ship transactional mail over HTTP or SMTP from verified domains.
Transactional send API
POST /emails, batch up to 100, schedule/cancel/resend, Idempotency-Key, tags, headers, and attachments.
Emails API →Templates
Visual block editor with versioned publish, {{variables}}, starters, and managed unsubscribe when you need it.
Templates →SMTP relay
Drop-in SMTP for apps that still speak port 587 — same domains, billing, and suppressions as the API.
SMTP →React Email
Use the open-source React Email toolchain in your app; the Node SDK compiles components via `@react-email/render` and sends through our API.
React Email guide →Platform
Receive
Inbound email on your domains without bolting on another provider.
Platform
Orchestrate
React to delivery and product events in your stack.
Webhooks
Signed delivery lifecycle events with dashboard testing and SDK verify helpers.
Webhooks →Automations
Event-triggered multi-step flows: send email, branch on conditions, inspect runs.
Automations →Events API
POST /events to drive automations from your product when something happens upstream.
Events →Platform
Agents & clients
Official clients in five languages, for humans and agents — not a docs-only SDK story.
Node SDK
supersendtx on npm: emails, domains, webhooks, templates, suppressions, SMTP credentials, and more.
Node SDK →Python, PHP, Ruby & Go
The same client on PyPI, Packagist, RubyGems, and the Go module proxy — plus a Laravel package with config and facade.
Language SDKs →CLI
supersendtx CLI with broad API parity for scripts and local debugging.
Emails + CLI →MCP & Agent Skills
Hosted MCP (OAuth or API key), local stdio, and Agent Skills for Cursor and similar agents.
MCP →Platform
Deliverability & ops
Domains, safety rails, and a path off your current vendor.
Domains & DNS
SPF, DKIM, return-path, and DMARC guidance — plus one-click apply for Cloudflare and GoDaddy.
Domains →Suppressions
Account-scoped suppressions from bounces, complaints, and manual adds — blocked sends surface clearly.
Suppressions →Deliverability insights
Delivery, bounce, and engagement metrics over 7 and 30 days.
Deliverability →Migrations
Field-mapping guides and aliases for Resend, Postmark, Amazon SES, and SendGrid.
Migrate →Infrastructure
Free to Dedicated without changing your code
Self-test without a card, unlock Free production on your verified domain, grow volume on Pro or Scale, and move to managed servers and IPs when isolation matters.
Free
$0
3,000/mo · domain + card on file
Pro / Scale
Volume
Transactional network — marketing never shares this pipe
Dedicated
Managed
your servers and IPs
API
Unchanged
same contract at every tier
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.