SMTPdiagnostic
SMTPdiagnostic is a free tool for testing SMTP connections.
Free SMTP utility
SMTPdiagnostic is a free desktop application designed to validate SMTP server configurations. In addition to the normal connectivity checks and test message delivery, it supports advanced functionality such as creating custom headers. Custom headers are very useful for use with receiving servers or mail clients with advanced functionality for handling and processing incoming messages.
Example screenshot of the SMTPdiagnostic utility.
Functionality
Test email server connectivity settings and communications.
- Easily test connectivity to non-standard ports
- Test plaintext or encrypted connections
- Simple to test with and without authorization
- Easily add custom headers
File Downloads
Visit the downloads page to find more than the latest version of the SMTPdiagnostic utility application.
Downloads