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. pdf magazines archive
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. Eleanor, a graphic designer whose aesthetic leaned toward
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. Her father had been a librarian at a
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.
Eleanor, a graphic designer whose aesthetic leaned toward the brutalist-minimalist, almost deleted it. Her father, Arthur, had been a digital hoarder. When he passed six months ago, he left her a mess of external hard drives, login credentials for defunct forums, and a single, cryptic instruction: Don’t let the server die.
Her father had been a librarian at a small community college, a man who wore cardigans and spoke softly about the Dewey Decimal System. But this was not librarian work. This was the work of an archivist possessed.
To get the most out of your digital archive, consider these best practices:
A PDF magazines archive is both a technical infrastructure and a curatorial act. By adopting PDF/A, rigorous metadata, and clear access policies, collectors and institutions can ensure that digital magazines remain readable, searchable, and contextually rich for decades. The key is balancing preservation standards with practical constraints—an imperfect archive that is shared openly is better than a perfect one locked on a dead hard drive.
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
Eleanor, a graphic designer whose aesthetic leaned toward the brutalist-minimalist, almost deleted it. Her father, Arthur, had been a digital hoarder. When he passed six months ago, he left her a mess of external hard drives, login credentials for defunct forums, and a single, cryptic instruction: Don’t let the server die.
Her father had been a librarian at a small community college, a man who wore cardigans and spoke softly about the Dewey Decimal System. But this was not librarian work. This was the work of an archivist possessed.
To get the most out of your digital archive, consider these best practices:
A PDF magazines archive is both a technical infrastructure and a curatorial act. By adopting PDF/A, rigorous metadata, and clear access policies, collectors and institutions can ensure that digital magazines remain readable, searchable, and contextually rich for decades. The key is balancing preservation standards with practical constraints—an imperfect archive that is shared openly is better than a perfect one locked on a dead hard drive.
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.