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. gta v build 350 online 126 exclusive
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. Dominate the streets
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. in the latest Rockstar Games updates , or
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.
The 1.26 update (Build 350.1 on PC) focused heavily on restoring visual fidelity and fixing game-breaking bugs:
If you are looking for features in the current official version of GTA Online (Enhanced for PC, PS5, and Xbox Series X|S), the latest major updates include: 1. New Businesses & Properties
: Customizable luxury estates recently added to the GTA Online 2026 update cycle.
Featuring items from discontinued events and developer-only drops that are no longer available through standard gameplay. Dominate the streets. Own the unattainable.
GTA V Build 350 – Online Version 126 (Exclusive Access)
: Modern builds now include kernel-based protection and proactive moderation. in the latest Rockstar Games updates , or are you looking for a troubleshooting guide for older game builds?
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
The 1.26 update (Build 350.1 on PC) focused heavily on restoring visual fidelity and fixing game-breaking bugs:
If you are looking for features in the current official version of GTA Online (Enhanced for PC, PS5, and Xbox Series X|S), the latest major updates include: 1. New Businesses & Properties
: Customizable luxury estates recently added to the GTA Online 2026 update cycle.
Featuring items from discontinued events and developer-only drops that are no longer available through standard gameplay. Dominate the streets. Own the unattainable.
GTA V Build 350 – Online Version 126 (Exclusive Access)
: Modern builds now include kernel-based protection and proactive moderation. in the latest Rockstar Games updates , or are you looking for a troubleshooting guide for older game builds?
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.