One API. Every email you send.
Transactional, marketing, validation, IP warmup, and signed webhooks — unified in a single Relayly integration. What used to take five vendors now takes one API call.
01# Send your first email with Relayly.
02curl https://api.relayly.io/api/v1/transactional/send \
03 -H 'X-API-Key: YOUR_API_KEY' \
04 -d '{
05 "from": "Ada <ada@yourbrand.com>",
06 "to": "ops@customer.dev",
07 "subject": "Welcome aboard",
08 "html": "<h1>You are in!</h1>"
09 }'
10
11
From your app to the inbox
One API call. Relayly validates the address, sends from a warmed IP, tracks engagement, and streams signed events back to you.
REST API, SMTP relay, or the Python & Node SDKs — send your first email in minutes.
Real-time syntax, MX and mailbox verification protects your sender reputation.
Automated IP warmup and reputation monitoring keep you out of the spam folder.
Delivered, opened, clicked, bounced — HMAC-signed webhooks in real time.
Everything you need to send email well
Six tools’ worth of infrastructure behind a single API key — from sending and validation to warmup, webhooks, and analytics.
Transactional API
Low-latency sends with idempotent requests, templating, and open/click tracking — built for production apps.
Marketing campaigns
Lists, segments, sequences, and A/B testing — with one-click unsubscribe handled for you.
Email validation
Verify addresses in real time — syntax, MX, disposable, role, catch-all and SMTP checks — to protect your reputation.
Deliverability & warmup
Automated, volume-gated IP warmup, per-domain DKIM/SPF/DMARC, blacklist monitoring and reputation scoring.
Signed webhooks
Real-time, HMAC-signed events for delivered, opened, clicked, bounced and complained — with retries.
Analytics & logs
Per-message logs, provider breakdowns, and dashboards that show exactly what happened to every email.
Built to reach the inbox, not the spam folder
Reputation is everything. Relayly automates the hard parts so your email shows up where it should.
- Suppression, bounce and complaint handling — built in, automatic
- Separate reputation streams for transactional and marketing
- Auto-throttling backs off before providers ever flag you
- Validate every list before you send to keep bounces low
Built on solid engineering, not promises
Encryption in transit and at rest, scoped API keys, signed webhooks, and privacy by design — the fundamentals done right from day one.
Encryption everywhere
TLS 1.2+ on every connection and AES-256 at rest — your content is unreadable in transit and on disk.
Security overviewv1=3f9c4a72b8…d61esignature verifiedSigned webhooks
Every event is HMAC-SHA256 signed, so your endpoint can trust each payload.
Compliance built in
Consent, one-click unsubscribes and deletion requests handled for you.
GDPRCCPACAN-SPAMScoped API keys
Least-privilege scopes with instant revocation — and MFA on every account.
sendreadrevokePrivacy by design
Your data is never sold or used for training — your lists stay yours.
Ready to send with confidence?
Everything about sending, deliverability and getting started — and a real human if you need one.
Yes — every account includes 100 emails per month free, forever, with no credit card required. Upgrade only when you grow.
Relayly unifies transactional sending, marketing campaigns, real-time validation, and automated deliverability tooling in a single API — so you don't have to stitch together five vendors.
Absolutely. One platform handles password resets and receipts as well as newsletters, sequences, and campaigns — with separate reputation management for each stream.
Yes. We provision dedicated IPs with reverse DNS and run automated, volume-gated warmup that ramps your sending on real, engaged traffic to build reputation safely.
Any — Relayly is a standard REST API with official Python and Node SDKs, an authenticated SMTP relay, and signed webhooks. If your stack can make an HTTPS request, it works.
Minutes. Create an account, grab an API key, and send your first email with a single API call or SDK method. Our quickstart walks you through it end to end.
Start sending with Relayly
Create a free account, grab an API key, and send your first email today.
No credit card required.