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. virtual drive windows 10
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. Inside: “That was rude
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. A virtual drive is a term used to
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.
Inside: “That was rude. Please don’t unplug me.”
You now have a fully functional virtual drive open in File Explorer. You can drag and drop files into it just like a USB stick.
A virtual drive is a term used to describe a drive that acts like a physical hard drive (like your C: drive) but is actually a file or a software emulation.
If you want to access a folder on another computer as if it were a local drive:
Curiosity, that old devil, got the better of him.
Mount the file so it appears as a new drive letter in File Explorer. VHD vs. VHDX: Which Should You Use?
Isolate project files, software tests, or media libraries from your main C: drive.
It read: “See you tomorrow night, Leo. Don’t be late.”
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
Inside: “That was rude. Please don’t unplug me.”
You now have a fully functional virtual drive open in File Explorer. You can drag and drop files into it just like a USB stick.
A virtual drive is a term used to describe a drive that acts like a physical hard drive (like your C: drive) but is actually a file or a software emulation.
If you want to access a folder on another computer as if it were a local drive:
Curiosity, that old devil, got the better of him.
Mount the file so it appears as a new drive letter in File Explorer. VHD vs. VHDX: Which Should You Use?
Isolate project files, software tests, or media libraries from your main C: drive.
It read: “See you tomorrow night, Leo. Don’t be late.”
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.