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. Download Macos Catalina 10.15.7 Iso File --39-LINK--39-
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints. The keyword phrase "Download Macos Catalina 10
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures. Instead, they provide an that can be converted
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 keyword phrase "Download Macos Catalina 10.15.7 Iso File --LINK--" contains a red flag that demands immediate attention. The --LINK-- placeholder (or variations like download links embedded with special formatting) frequently appears in:
Your completed, verified macOS Catalina 10.15.7 ISO file will now be sitting on your desktop.
Apple does not provide a direct ISO file for macOS Catalina 10.15.7. Instead, they provide an that can be converted into an ISO file using Terminal . 1. Download the macOS Catalina Installer To get the official files from Apple's servers:
An ISO file is a standard disk image format used to install operating systems on virtualized environments like VMware, VirtualBox, and Parallel Desktop, or to create bootable media for Windows PCs.
You need at least 20 GB of free space for the download and temporary files .
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 keyword phrase "Download Macos Catalina 10.15.7 Iso File --LINK--" contains a red flag that demands immediate attention. The --LINK-- placeholder (or variations like download links embedded with special formatting) frequently appears in:
Your completed, verified macOS Catalina 10.15.7 ISO file will now be sitting on your desktop.
Apple does not provide a direct ISO file for macOS Catalina 10.15.7. Instead, they provide an that can be converted into an ISO file using Terminal . 1. Download the macOS Catalina Installer To get the official files from Apple's servers:
An ISO file is a standard disk image format used to install operating systems on virtualized environments like VMware, VirtualBox, and Parallel Desktop, or to create bootable media for Windows PCs.
You need at least 20 GB of free space for the download and temporary files .
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.