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. pdfdrivenet books top
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. Here are some of the top books available
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. : A huge portion of the "top" traffic
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.
Here are some of the top books available on PDFDriveNet:
Harari’s masterpiece is the bridge between science and history. On PDFDriveNet, it holds the record for the longest time spent on the "Trending" list (over 18 months). The book’s maps and timelines are crisp in the PDF format, making it superior to standard text-only e-books.
: A huge portion of the "top" traffic comes from students looking for expensive textbooks or prep guides like " SAT Prep Plus " or " Medical Microbiology
: This section ranks books based on the number of downloads and recent traffic .
Self-improvement remains the most popular category on the platform. Readers frequently turn to these classics to reshape their mindsets: The Art of Thinking Clearly by Rolf Dobelli: This book explores the common cognitive biases
: Features include "Editor's Picks," "Most Popular," and a "PDF Drive Hope" program where users can request specific books from the community. Google Play Popular & Top-Rated Books (2026 Trends)
A staple for those interested in social dynamics and strategy.
by Viktor E. Frankl – A perennial favorite in psychology and philosophy : Entangled Life
: While the site is generally cleaner than most, always scan downloaded PDFs with antivirus software before opening them.
Users can download multiple books daily without hitting hard caps.
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
Here are some of the top books available on PDFDriveNet:
Harari’s masterpiece is the bridge between science and history. On PDFDriveNet, it holds the record for the longest time spent on the "Trending" list (over 18 months). The book’s maps and timelines are crisp in the PDF format, making it superior to standard text-only e-books.
: A huge portion of the "top" traffic comes from students looking for expensive textbooks or prep guides like " SAT Prep Plus " or " Medical Microbiology
: This section ranks books based on the number of downloads and recent traffic .
Self-improvement remains the most popular category on the platform. Readers frequently turn to these classics to reshape their mindsets: The Art of Thinking Clearly by Rolf Dobelli: This book explores the common cognitive biases
: Features include "Editor's Picks," "Most Popular," and a "PDF Drive Hope" program where users can request specific books from the community. Google Play Popular & Top-Rated Books (2026 Trends)
A staple for those interested in social dynamics and strategy.
by Viktor E. Frankl – A perennial favorite in psychology and philosophy : Entangled Life
: While the site is generally cleaner than most, always scan downloaded PDFs with antivirus software before opening them.
Users can download multiple books daily without hitting hard caps.
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.