SMTP & Email API Test Utility
A free, native tool for testing SMTP relay servers and email API providers. Built for email administrators, developers, and IT professionals who need to quickly verify email delivery configurations.
Windows, macOS & CLI available now
Clean, intuitive interface designed for professionals. Test SMTP servers, preview HTML emails, and diagnose delivery issues.
Main Interface - SMTP Configuration
Send test emails through any SMTP server or choose from 12 integrated API providers. Inspect TLS certificates, diagnose delivery issues, and securely store credentials.
Save SMTP and API credentials securely with AES-256-GCM encryption. Master password protection keeps your credentials safe between sessions. after effects project videohive circus 128411 better
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. : This project was originally designed for 1080p
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. after effects project videohive circus 128411 better
Compose in plain text or HTML with auto-detection. Live preview with rendered and raw source views. 6 preloaded templates included.
One-click sending via SendGrid, Mailgun, Amazon SES, Postmark, Brevo, and 7 more providers with built-in authentication handling.
No analytics, no tracking, no data collection. Your credentials stay local. App Sandbox enabled for maximum security.
One-click API-based sending with all major email service providers. Authentication handled automatically.
: This project was originally designed for 1080p. If you need 4K output, use After Effects' "Detail-Preserving Upscale" effect or Topaz Video AI on the background assets to avoid pixelation on large screens.
: For better performance, try to organize layers and compositions logically. This can improve render times and make your project easier to navigate.
Don't just render. Customize. Wiggle the camera. Dirty up the film stock. Make the audience smell the popcorn and hear the ringmaster.
Live HTML Email Preview
6 Pre-loaded Email Templates
No subscriptions, no limitations, no strings attached.
Windows 10/11 (x64)
Version 1.0.7.0
macOS 14.0+ (Universal)
Version 1.08
Python (Cross-platform)
Open Source
: This project was originally designed for 1080p. If you need 4K output, use After Effects' "Detail-Preserving Upscale" effect or Topaz Video AI on the background assets to avoid pixelation on large screens.
: For better performance, try to organize layers and compositions logically. This can improve render times and make your project easier to navigate.
Don't just render. Customize. Wiggle the camera. Dirty up the film stock. Make the audience smell the popcorn and hear the ringmaster.
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.