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. -------- Recovery Mode Toolbox V4 48
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. : Recognizes and breaks perpetual startup cycles where
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. "A simulation error
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.
: Recognizes and breaks perpetual startup cycles where the OS crashes at the boot logo phase.
Have you already for your device's chipset? Share public link
"That was a dream," the system-soothing voice replied. "A simulation error."
While not a standard manufacturer feature from companies like Samsung or Apple , recovery "toolboxes" are typically third-party interfaces used for: : Fixing boot loops or corrupted partitions.
When device is in Toolbox recovery, you can use ADB (if enabled):
The is favored for its robustness. It is not designed for beginners, but rather for those who have moved beyond standard Safe Mode troubleshooting. When a device is bricked, this tool provides the direct access needed to fix the underlying issues, often acting as a final line of defense before a total factory reset. Safety and Best Practices
adb shell # Now in recovery environment, typically as root
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
: Recognizes and breaks perpetual startup cycles where the OS crashes at the boot logo phase.
Have you already for your device's chipset? Share public link
"That was a dream," the system-soothing voice replied. "A simulation error."
While not a standard manufacturer feature from companies like Samsung or Apple , recovery "toolboxes" are typically third-party interfaces used for: : Fixing boot loops or corrupted partitions.
When device is in Toolbox recovery, you can use ADB (if enabled):
The is favored for its robustness. It is not designed for beginners, but rather for those who have moved beyond standard Safe Mode troubleshooting. When a device is bricked, this tool provides the direct access needed to fix the underlying issues, often acting as a final line of defense before a total factory reset. Safety and Best Practices
adb shell # Now in recovery environment, typically as root
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.