01
Transactional API
Sub-second sends with idempotent requests, templating, open/click tracking, and a 99.99% uptime SLA.
Trusted email infrastructure for modern teams
The email platform that actually lands in the inbox
Send transactional and marketing email through one fast API — with built-in address validation, automated IP warmup, and real-time webhooks. Engineered for deliverability, priced for scale.
No credit card required · 99.99% uptime SLA · Global infrastructure
99.2%
Inbox placement
Powering email for fast-growing teams worldwide
NorthPeakCobaltLumenDriftwoodMercatoVantageBeaconNorthPeakCobaltLumenDriftwoodMercatoVantageBeacon
01How it works
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.
02One platform
Everything you need to send email well
Stop stitching together five vendors. Relayly unifies sending, validation, and deliverability.
02
Marketing campaigns
Lists, segments, sequences, and A/B testing — with one-click unsubscribe handled for you.
03
Email validation
Verify addresses in real time — syntax, MX, disposable, role, catch-all and SMTP checks — to protect your reputation.
04
Deliverability & warmup
Automated, volume-gated IP warmup, per-domain DKIM/SPF/DMARC, blacklist monitoring and reputation scoring.
05
Signed webhooks
Real-time, HMAC-signed events for delivered, opened, clicked, bounced and complained — with retries.
06
Analytics & logs
Per-message logs, provider breakdowns, and dashboards that show exactly what happened to every email.
03Deliverability
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.
- ✓ Automated IP warmup that ramps on real, engaged volume
- ✓ Dedicated IPs with reverse DNS and per-domain authentication
- ✓ Real-time blacklist & reputation monitoring with auto-throttling
- ✓ Built-in suppression, bounce, and complaint handling
- ✓ Validate every list before you send to keep bounces low
99.99%
Delivery uptime
<200ms
Median API latency
12B+
Emails sent / year
4.9/5
Customer rating
★★★★★
“Moving to Relayly lifted our inbox placement 18% in a week. The warmup automation paid for itself instantly — and we retired two other vendors in the process.”
Ava ChenVP Engineering, NorthPeak
SOC 2 Type IIGDPR compliantCCPA ready99.99% uptime SLA
04FAQ
Questions, answered
Is there a free plan?
Yes — every account includes 3,000 emails per month free, forever, with no credit card required. Upgrade only when you grow.
How is Relayly different from other email providers?
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.
Can I send both transactional and marketing email?
Absolutely. One platform handles password resets and receipts as well as newsletters, sequences, and campaigns — with separate reputation management for each stream.
Do you support dedicated IPs and IP warmup?
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.
What languages and frameworks do you support?
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.
How fast can I get started?
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 in minutes
Create a free account, grab an API key, and send your first email today. No credit card required.