High-Performance SMTP Relay for Developers
Send transactional and bulk email through our globally distributed SMTP infrastructure. Sub-second delivery, automatic failover, and detailed delivery logs — built for applications that can't afford downtime.
Key Features
Everything you need to smtp relay effectively, built into one platform.
Global Edge Network
Send from 12 data centers worldwide. Emails route through the nearest node for minimum latency and maximum delivery speed.
Dedicated IP Addresses
Get your own IP with full reputation control. Includes automated IP warming and blacklist monitoring.
Automatic Failover
Multi-path routing with instant failover ensures your emails are delivered even during regional outages.
Real-Time Logs
Track every message with detailed SMTP logs — accepted, delivered, bounced, deferred, and rejected events.
TLS Encryption
All connections secured with TLS 1.3. Support for STARTTLS, SSL/TLS ports 465 and 587.
Volume Scaling
From 100 emails/day to 10 million+/day without infrastructure changes. Pay only for what you send.
Learn More
Dive deeper into how SprintMailer helps you achieve better results.
SMTP Infrastructure You Can Trust
When your application sends password resets, order confirmations, or marketing blasts, downtime isn't an option. SprintMailer's SMTP relay is engineered for reliability at scale.
Our infrastructure processes over 2.5 billion emails monthly with a 99.99% uptime SLA. Automatic retries, intelligent queue management, and ISP-specific throttling ensure maximum deliverability.
Simple Integration, Powerful Results
Connect in minutes using standard SMTP credentials or our REST API. SprintMailer works with any application, framework, or programming language.
We provide SDKs for Node.js, Python, PHP, Ruby, Go, and .NET, plus comprehensive API documentation with copy-paste examples.
Dedicated IPs & Domain Authentication
Shared IP pools work for low volumes, but high-volume senders need dedicated IPs to protect their sender reputation. SprintMailer offers:
Dedicated IP provisioning
with automated 30-day warming schedule
Custom reverse DNS (rDNS)
matching your sending domain
SPF, DKIM, DMARC
setup wizard with DNS record validation
Feedback loop processing
for Gmail, Yahoo, Microsoft, and AOL
Monitoring & Deliverability Insights
Every SMTP transaction is logged and searchable. Filter by recipient, status, time range, or error code. Set up webhooks to receive real-time delivery events in your application.
Our deliverability dashboard shows bounce rates, complaint rates, and inbox placement trends over time — so you can catch problems before they affect your sender reputation.
SMTP Relay pricing
Plans for high-volume SMTP relay and application email.
Prices shown in $ · Secure checkout via PayPal
Basic
Best for single users starting with email and multi-channel marketing.
Contact for pricing
- 5,000+ emails/month
- Email & SMS campaigns
- Drag & drop editor
- Email templates library
- AI content generator
- Advanced segmentation
- Signup forms & landing pages
- Basic reporting & analytics
- Email support
Pro
Best for small businesses ready to automate and test campaigns.
Contact for pricing
Everything in Basic, plus:
- Marketing automation workflows
- A/B testing (subject, content, send time)
- Advanced email reporting (heatmaps, devices)
- AI send time optimization
- Web & event tracking
- Landing pages (1 included)
- No SprintMailer logo included
Growth
Best for teams leveraging data and AI to drive growth across channels.
Contact for pricing
Everything in Pro, plus:
- From 150,000 emails/month
- WhatsApp, popups & web push channels
- Multi-user access (10 seats)
- Contact scoring & lead alerts
- Advanced ecommerce features
- AI segmentation
- AI campaign insights
- Phone & chat support
- Deliverability specialist support
Enterprise
Best for companies with 1M+ contacts needing custom solutions & full data control.
Custom price
Everything in Growth, plus:
- Multi-account management
- Custom objects & data model
- Mobile wallet & loyalty modules
- Custom data integrations
- Dedicated IP & SSO/SAML
- Tailored onboarding
- Dedicated customer success manager
Customize your plan
Pick a tier, adjust monthly volume, and add optional extras.
Customize your plan
Selected: 5,000 emails/month
Add-ons & options
Remove SprintMailer logo
Send campaigns without SprintMailer branding in the footer.
$8 per month
SMS campaigns
SMS pricing based on volume and destination.
Sales Essentials
CRM pipelines, sales automation, and live chat.
$28 per month
Included in Basic
- 5,000+ emails/month
- Email & SMS campaigns
- Drag & drop editor
- Email templates library
- AI content generator
- Advanced segmentation
Your plan
- Basic featuresContact us
- 5,000 emails/monthIncluded
- 500 contactsIncluded
- Email & SMS readyIncluded
- Basic reportingIncluded
Contact for pricing
Frequently Asked Questions
Common questions about smtp relay.
Related Services
Explore more SprintMailer email solutions.
Start sending via SMTP today
Get your SMTP credentials in under 5 minutes. Free tier includes 1,000 emails/month.
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