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.
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints.
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures.
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 major software update can sometimes leave behind corrupted temporary files. Go to Settings > Storage & Reset > Factory Data Reset to clear the system and start fresh. Why You Should Keep Your Viano TV Updated
: Use this if you have downloaded a firmware file from the Viano Support Website onto a USB drive.
Your Viano TV cannot read filesystems like NTFS or exFAT. Insert a USB stick (16GB or smaller is ideal) into your computer. Right-click the drive, select Format , choose FAT32 as the file system, and click start. This will erase all data on the drive. Phase 2: Acquire the Correct Firmware
: Firmware updates often resolve system lag, audio-video syncing delays, and unexpected crashing. viano tv software update
After the installation completes and the TV reboots into the initial setup wizard, perform these final steps to ensure a completely clean system deployment:
Method 2: Manual USB Firmware Installation (For Offline TVs)
Many Viano TV owners report apps like Netflix, YouTube, Stan, Kayo, and Disney+ either crashing or being completely unavailable. : A major software update can sometimes leave
—is a mixed bag. While updates are intended to provide essential security patches and feature fixes, user experiences suggest that the process can be hit-or-miss for this specific brand. Overview of the Update Experience Viano TVs typically run on an Android-based OS , meaning updates are generally found by navigating to Settings > Device Preferences > About > System Update
: New software ensures streaming apps remain compatible with the latest platform requirements.
This generic origin has several significant implications: Your Viano TV cannot read filesystems like NTFS or exFAT
Testing plan (suggested)
Firmware Update Procedure for Viano Integrated Television Module Applies to: Mercedes-Benz Viano (W639) factory RSE (Rear Seat Entertainment) & compatible aftermarket units
✅ Note: Your Viano TV must have at least 500MB of free storage for the update. Delete old apps if needed.
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 major software update can sometimes leave behind corrupted temporary files. Go to Settings > Storage & Reset > Factory Data Reset to clear the system and start fresh. Why You Should Keep Your Viano TV Updated
: Use this if you have downloaded a firmware file from the Viano Support Website onto a USB drive.
Your Viano TV cannot read filesystems like NTFS or exFAT. Insert a USB stick (16GB or smaller is ideal) into your computer. Right-click the drive, select Format , choose FAT32 as the file system, and click start. This will erase all data on the drive. Phase 2: Acquire the Correct Firmware
: Firmware updates often resolve system lag, audio-video syncing delays, and unexpected crashing.
After the installation completes and the TV reboots into the initial setup wizard, perform these final steps to ensure a completely clean system deployment:
Method 2: Manual USB Firmware Installation (For Offline TVs)
Many Viano TV owners report apps like Netflix, YouTube, Stan, Kayo, and Disney+ either crashing or being completely unavailable.
—is a mixed bag. While updates are intended to provide essential security patches and feature fixes, user experiences suggest that the process can be hit-or-miss for this specific brand. Overview of the Update Experience Viano TVs typically run on an Android-based OS , meaning updates are generally found by navigating to Settings > Device Preferences > About > System Update
: New software ensures streaming apps remain compatible with the latest platform requirements.
This generic origin has several significant implications:
Testing plan (suggested)
Firmware Update Procedure for Viano Integrated Television Module Applies to: Mercedes-Benz Viano (W639) factory RSE (Rear Seat Entertainment) & compatible aftermarket units
✅ Note: Your Viano TV must have at least 500MB of free storage for the update. Delete old apps if needed.
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.