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SendGrid alternative for transactional email
SendGrid is built for high-volume mail across marketing and transactional use cases. SuperSend TX is transactional-only: a focused API on infrastructure we operate, with Pool and Dedicated tiers when you need isolation.
- Transactional only
- Flat POST /emails
- Owned Pool · Dedicated
At a glance
Transactional focus without the marketing stack
If you only need receipts, auth mail, and alerts, a dedicated transactional product is simpler than a dual-purpose ESP.
| Attribute | SendGrid | SuperSend TX |
|---|---|---|
| Focus | Marketing + transactional | Transactional only |
| Send API | POST /v3/mail/send | POST /emails |
| Auth | SG.… API key | Bearer stx_… |
| Payload | personalizations + content[] | Flat from / to / subject / html |
| npm | @sendgrid/mail | supersendtx |
| Infra story | Twilio SendGrid cloud | Owned transactional network; Dedicated available |
| Entry paid plan | SendGrid Essentials / Pro | Pro from $20/mo · Scale volume slider |
Who this is for
Products that only need transactional mail
Skip newsletters and campaigns in the same product. Keep critical sends on a network that never carries marketing blast noise.
Transactional only
Pool is for mail that has to arrive — receipts, auth, alerts — not campaigns and newsletters.
Flat send payloads
from, to, subject, html — no nested personalizations array for everyday transactional sends.
Deliverability ops included
Warmup, bounce handling, complaints, suppressions, and open/click signals managed on the platform.
Path to Dedicated
Owned servers and IPs when you need isolation — same API as Pool, managed by us.
Migration
Replace v3 mail/send with POST /emails
Swap the package, flatten the payload, and map Event Webhook handlers to signed SuperSend TX endpoints.
- 1
Create a key
Issue a stx_ API key and verify the domain you send from.
- 2
Swap the client
Replace @sendgrid/mail (or raw v3 calls) with supersendtx or HTTP.
- 3
Flatten the body
Map personalizations and content[] into flat from / to / subject / html fields.
- 4
Reconnect events
Remap Event Webhook handlers using the SendGrid migration guide.
- No marketing product surface to configure for a pure transactional use case
- SMTP relay for apps that already speak SMTP
- Webhooks, templates, automations, inbound, SDK, CLI, and MCP on every plan
Move transactional off SendGrid
Keep marketing where it lives. Run critical transactional mail on owned SuperSend TX infrastructure.