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. RKAndroidTool v1.35
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. Problem : v1
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. This report evaluates the functionality
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.
Problem: v1.35 can flash but has limited backup capabilities (mostly just firmware dump).
Feature Idea:
This report evaluates the functionality, performance, and operational use of RKAndroidTool v1.35 (Rockchip Android Tool). The utility is designed for flashing firmware, upgrading, and performing low-level maintenance on Rockchip-based Android devices (e.g., RK30xx, RK31xx, RK32xx, RK33xx). Testing confirms that the tool successfully performs device detection, image loading, and partition flashing under standard conditions.
RKAndroidTool v1.35 is a utility for flashing, upgrading, and managing firmware on Rockchip-based Android devices (tablets, TV boxes, development boards). It provides device detection, loader/firmware flashing, and basic device maintenance functions.
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
Problem: v1.35 can flash but has limited backup capabilities (mostly just firmware dump).
Feature Idea:
This report evaluates the functionality, performance, and operational use of RKAndroidTool v1.35 (Rockchip Android Tool). The utility is designed for flashing firmware, upgrading, and performing low-level maintenance on Rockchip-based Android devices (e.g., RK30xx, RK31xx, RK32xx, RK33xx). Testing confirms that the tool successfully performs device detection, image loading, and partition flashing under standard conditions.
RKAndroidTool v1.35 is a utility for flashing, upgrading, and managing firmware on Rockchip-based Android devices (tablets, TV boxes, development boards). It provides device detection, loader/firmware flashing, and basic device maintenance functions.
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.