Send Emails via SMTP or API
Use our HTTP API for modern apps or drop in SMTP credentials for any legacy system. Same deliverability, same pricing, zero lock-in.
SMTP that works with everything
Full authentication, tracking, and deliverability out of the box
Simple Configuration
Quick setup with your project credentials. Works with any email client or application.
Secure Connections
TLS/SSL encryption on ports 465 and 587. Your emails are always transmitted securely.
Universal Compatibility
Works with Outlook, Thunderbird, Apple Mail, or any SMTP-compatible application. Even that ancient email client from 2005.
Domain Validation
Automatic verification that your sender domain is verified before accepting emails.
Full Feature Support
Attachments, custom headers, HTML emails, and multiple recipients. Send those cat memes with confidence.
Same Infrastructure
SMTP emails use the same reliable delivery infrastructure as API emails with full tracking.
SMTP vs API
Choose the right option for your use case
| Feature | Traditional SMTP | Plunk SMTP | Plunk API |
|---|---|---|---|
| Protocol | SMTP | SMTP | HTTP/REST |
| Setup Complexity | Medium | Easy | Easy |
| Tracking & Analytics | ✗ | ✓ | ✓ |
| Works with Email Clients | ✓ | ✓ | ✗ |
| Domain Verification | Manual | Automatic | Automatic |
| Attachments | ✓ | ✓ | ✓ |
| Template Support | ✗ | ✗ | ✓ |
| Workflow Automation | ✗ | ✗ | ✓ |
Recommendation: Use API for modern applications with workflow automation. Use SMTP for email clients and legacy systems.
When to use SMTP
Perfect for these scenarios
Legacy System Integration
Already have applications using SMTP? No need to rewrite code. Just swap your SMTP credentials and keep everything else the same. Your PM will love you.
Email Client Sending
Marketing teams can send emails directly from Outlook, Thunderbird, or Apple Mail using familiar tools without learning new APIs.
Framework Compatibility
Works with any framework or language that supports SMTP. Perfect for older systems or platforms without HTTP API support.
Start sending via SMTP
Get your SMTP credentials and start sending emails from any client or application. No credit card required.