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.
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
: Learning not to stay "prostrate" or defeated after a failure. Family Unity : Valuing siblings and understanding parents.
Sangre de Campeón is not a book you read for entertainment; it is a book you read for inoculation. It inoculates you against self-pity, against mediocrity, and against the lie that you are a victim of fate. It demands you look in the mirror and ask: Do I have the blood of a champion, or the spirit of a quitter? libro sangre de campeon
The book’s brilliance lies in its simplicity: it breaks down complex psychological resilience into digestible, almost military-like rules. The "Ten Commandments of a Champion" (discipline, respect, solidarity, etc.) are not just moral platitudes; they are survival tools. : Learning not to stay "prostrate" or defeated
: A champion accepts the consequences of their acts. It inoculates you against self-pity, against mediocrity, and
Sangre de campeón. ... This book tells the exciting story of Felipe, a child who, when facing challenges and enemies in school, re... Spanish Publishers Sangre de Campeon Invencible - World of Books The feel-good place to buy books * Free US shipping over $15. * Buying preloved emits 41% less CO2 than new. * Millions of afforda... World of Books Sangre de Campeon Invencible - World of Books Table_title: More books in the Sangre De Campeon series Table_content: header: | SKU | CIN9687277491VG | row: | SKU: ISBN 13 | CIN... World of Books Resumen de "Sangre de Campeón" | PDF - Scribd REFUERZO ESCOLAR – 2025. ... Felipe era un niño de 12 años y tenía un hermano menor de 8 años y su nombre era Riky. ... hermano ya... Scribd SANGRE DE CAMPEÓN INVENCIBLE (Spanish Edition) Table_title: Product information Table_content: header: | Publisher | Editorial Diamante | row: | Publisher: Publication date | Ed... Amazon.com Sangre de campeón: 24 cualidades de un joven triunfador (Spanish ... Book details * Reading age. 8 years and up. * Part of series. Sangre de campeón. * Print length. 180 pages. Print length: 180 page... Amazon.com SANGRE DE CAMPEÓN INVENCIBLE: 03 - Amazon UK Disfruta la sensacional historia de una adolescente que viaja a otro país para aprender la cultura y el idioma. * About the author... Amazon UK This might be our most relatable board game yet 😅 Cats ... Feb 5, 2026 —
Some of the key themes and elements of the book include:
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.