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. rockchip rk3128 firmware
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. A thin tool, such as a paperclip or
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. It provides the necessary software framework for device
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.
A thin tool, such as a paperclip or toothpick, to press the recovery/reset button. 2. Software & Drivers
The Rockchip RK3128 firmware is a customized version of the Android operating system, optimized for the RK3128 SoC. It provides the necessary software framework for device manufacturers to create products with features like:
Flashing will erase all data, apps, and settings on the internal storage.
Look for trusted communities, Android forums, or official manufacturer download pages to locate original system images. Troubleshooting Common RK3128 Flashing Issues Tool Shows "No Devices Found"
Rockchip RK Batch Tool v1.8 or FactoryTool. How to Flash RK3128 Firmware (Step-by-Step)
A standard Rockchip firmware image is typically packaged as a single .img file. This package contains several critical partitions:
The Complete Guide to Rockchip RK3128 Firmware: Flashing, Upgrading, and Troubleshooting
…then a fresh firmware flash is your solution. A clean, debloated ROM can actually make this single-core Cortex-A7 chip feel snappy enough for Kodi, YouTube at 720p, and retro emulation (PS1, GBA, MAME).
Ensure you are holding down the physical Reset button firmly while plugging in the cable.
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
A thin tool, such as a paperclip or toothpick, to press the recovery/reset button. 2. Software & Drivers
The Rockchip RK3128 firmware is a customized version of the Android operating system, optimized for the RK3128 SoC. It provides the necessary software framework for device manufacturers to create products with features like:
Flashing will erase all data, apps, and settings on the internal storage.
Look for trusted communities, Android forums, or official manufacturer download pages to locate original system images. Troubleshooting Common RK3128 Flashing Issues Tool Shows "No Devices Found"
Rockchip RK Batch Tool v1.8 or FactoryTool. How to Flash RK3128 Firmware (Step-by-Step)
A standard Rockchip firmware image is typically packaged as a single .img file. This package contains several critical partitions:
The Complete Guide to Rockchip RK3128 Firmware: Flashing, Upgrading, and Troubleshooting
…then a fresh firmware flash is your solution. A clean, debloated ROM can actually make this single-core Cortex-A7 chip feel snappy enough for Kodi, YouTube at 720p, and retro emulation (PS1, GBA, MAME).
Ensure you are holding down the physical Reset button firmly while plugging in the cable.
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.