SMTP Test Tool is a free online utility designed to verify SMTP server configurations, test mail server connectivity, and diagnose email delivery issues. It is suitable for users who need to check SMTP connections before deploying email services, including developers and IT professionals working with providers such as Gmail, Office 365, SendGrid, Amazon SES, or custom SMTP servers.
The tool allows users to enter SMTP server details, such as server address, port, security type, username, and password. After entering these credentials, users can test the connection and, if desired, send a test email following a successful connection. Real-time connection logs are provided in a terminal output format, allowing for immediate diagnosis of configuration or delivery problems. SMTP credentials are used temporarily for testing and are never stored by the tool.
SMTP Test Tool also offers a quick reference guide for common SMTP providers, including recommended hostnames, ports, and security settings for services like Gmail, Microsoft 365, Amazon SES, and SendGrid. This feature helps users configure their email clients or servers accurately based on provider-specific requirements.
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In the Developer Tools space, SMTP Test Tool takes a focused approach. It focuses on diagnosing and verifying SMTP server configurations and email delivery issues without deploying code. It is built as a B2B product for developers. SMTP Test Tool costs nothing to use. It runs on the web and the command line.
SMTP Test Tool first shipped in 2022. Key capabilities include SMTP connection test, email delivery check, and real-time logs.
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