High-Deliverability Email SMTP OTP Gateway
Deliver verification emails and passwordless codes straight to your user's primary inbox. Sub-second dispatch, zero spam drop, and enterprise SMTP infrastructure.
Your One-Time Password (OTP)
Use the following security code to authenticate your sign-in request. This code is valid for 15 minutes.
Affordable Email OTP Plans
Transparent one-time pricing for authentication emails with guaranteed inbox placement.
1,900 OTPs
Perfect for testing, MVPs, and early user registrations.
High-deliverability authentication emails
Generous validity timeline
SPF/DKIM/DMARC authenticated
Compatible with all frameworks
5,000 OTPs
Optimal for production SaaS apps, portals, and passwordless logins.
High-deliverability authentication emails
Generous validity timeline
SPF/DKIM/DMARC authenticated
Compatible with all frameworks
Email OTP Features
Engineered to bypass spam filters and land verification codes in front of your users instantly.
Dedicated SMTP Relays
Clean IP reputation ensuring 99.9% direct-to-primary-inbox placement.
SPF, DKIM & DMARC Ready
Pre-configured domain authentication protocols for zero spam folder drops.
SMTP & REST API
Use standard SMTP port 587/465 or lightweight HTTPS REST endpoint.
Sub-Second Dispatch
Lightning fast transactional email infrastructure delivering in < 1 second.
Custom Sender Branding
Brand your OTP emails with your company name, custom logo, and styling.
TLS 1.3 Encryption
End-to-end transport layer security protecting sensitive authentication codes.
Works with Any Email Client or Codebase
Connect via standard SMTP credentials or send through our HTTPS REST API. Zero code refactoring needed if you already use SMTP.
// Standard SMTP Configuration
host: "smtp.flarelax.com"
port: 587 // or 465 (SSL)
secure: false // true for 465
auth: {
user: "YOUR_FLARELAX_SMTP_USERNAME",
pass: "YOUR_FLARELAX_SMTP_PASSWORD"
}Frequently Asked Questions
Answers to common questions about Flarelax Email SMTP OTP.
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