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FREE TOOL Email Deliverability & Spam Score Checker Deliverability Checker • Test SPF, DKIM, DMARC & SpamAssassin
MTA Relay: <750ms | 99.99% Uptime
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Reliable Transactional Email Delivery

Deliver your critical authentication codes, password resets, purchase receipts, and account alerts directly to the inbox in under 1.2 seconds.

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  • Transactional Emails
Transactional Email Analytics
Transactional Email Metrics
Mission-Critical Delivery

Why Transactional Emails Demand Dedicated Infrastructure

When a user requests a password reset or waits for an OTP during checkout, seconds matter. A delayed or spammed email translates immediately to abandoned carts and lost customer trust.

PhotonRelay isolates transactional traffic from bulk marketing streams, ensuring high-priority messages bypass shared queue congestion and hit primary inboxes in under 1.2 seconds.

    Core Transactional Use Cases:
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    One-Time Passwords (OTPs) & Multi-Factor Authentication
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    Password Reset & Account Recovery Links
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    Order Confirmations, Invoices & Billing Receipts
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    System Security Alerts & New Device Logins
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    Shipping, Tracking & Delivery Updates
Send 5,000 Free Transactional Emails

Built for Speed, Compliance & Reliability

Everything engineering teams need for transactional email peace of mind.

Sub-Second Delivery Speeds

Distributed edge relays maintain warm TCP and TLS connections to major mailbox providers, delivering your OTPs in under 1.2s without queue backpressure.

Primary Inbox Deliverability

Strict alignment with Google and Yahoo sender standards. Automated SPF, DKIM 2048-bit, and DMARC enforcement ensure your transactional alerts consistently land in the primary inbox.

Drop-In SMTP & REST API

Plug directly into standard SMTP port 587/465 or dispatch via modern JSON REST API endpoints. Compatible with Node.js, Python, PHP, Laravel, and Django.

Instant Webhook Callbacks

Receive immediate webhook alerts for delivery confirmation, open events, or bounces. Update your database and trigger retry logic seamlessly.

Automated Suppression Lists

Hard bounces, invalid mailboxes, and unsubscribe events are automatically suppressed to protect your sender score and prevent repeated ISP penalties.

Transparent Pay-Per-Use

Enjoy 5,000 free emails every month, followed by flat $0.50 per 1,000 emails. Invoiced on the 3rd with a 7-day grace period. Zero hidden fees.

Expert Deliverability Advisory

High-Volume Sending or Deliverability Challenges?

Whether you are migrating 500,000+ monthly emails, configuring dedicated IP pools with custom warming schedules, or resolving spam folder placement, our email delivery engineers are here to assist.

Speak to an Engineer Claim 5,000 Free Emails →