About
Conduit is a hosted SMTP-to-webhook gateway that receives inbound email and forwards each message to an application as an HTTP POST. It parses the email, signs the request with HMAC-SHA256, and supports SMTP retry behavior so senders can retry on transient failures without polling or mail libraries.
The service is aimed at developers who need to turn email into structured webhook events for alerts, form submissions, order notifications, device messages, mailing lists, and CI/CD triggers. It includes domain ownership verification, per-webhook rate limiting, custom payload templates, custom request headers, delivery history, and SMTP security policies with IP allowlists, SMTP AUTH, SPF, and DKIM checks.
- SMTP-to-webhook email gateway
- HMAC-SHA256 payload signing
- Per-webhook rate limiting
- Domain ownership verification
- Custom JSON payload templates
- Delivery history and audit logs
- SPF and DKIM verification
- SMTP AUTH and IP allowlists
Free Tier Value
This free tier is perpetual and has no published usage cap, so there isn’t a defensible monthly dollar equivalent to estimate. It appears to include the full product rather than a limited starter plan, and the page does not indicate that a credit card is required.
What's included in the free tier
Verified
- Free hosted SMTP-to-webhook gateway for inbound email delivery.
- Email addresses registered as live webhook endpoints.
- HTTP POST delivery of parsed email messages to your chosen URL.
- SMTP retry behavior for failed deliveries.
- HMAC-SHA256 signed deliveries with X-Conduit-Signature.
- Domain ownership verification via API and one DNS TXT record.
- Shared public domain use without verification.
- Per-webhook rate limiting with a maximum per minute.
- Custom JSON payload templates per webhook.
- Custom HTTP request headers on deliveries.
- Fine-grained SMTP error control via X-Conduit-SMTP-Code.
- Full delivery history in the web UI and API.
- SMTP security policies with source IP allowlisting, SMTP AUTH, SPF, and DKIM checks.
See Conduit pricing for current limits.
Common questions
Is Conduit free forever?
Yes. Conduit is free forever, with no time limit and no usage threshold that forces a paid plan.
What is Conduit's free tier worth?
Conduit's free tier has no dollar cap - it's unlimited, with no usage threshold that forces a paid plan. That maps to an FTV score of 90/100. The FTV score is explained at freetier.co/ftv.
