Product Introduction

1. SMTP‑Test.com is an online tool designed to validate and troubleshoot SMTP server configurations for email services like Gmail, Outlook, Amazon SES, and custom setups. It enables users to test outgoing email server connections, diagnose authentication errors, and verify port accessibility without requiring account creation or technical expertise.
2. The core value lies in its ability to provide instant, actionable feedback on SMTP server health, reducing time spent debugging email delivery issues. By simulating real-world email server interactions, it helps users identify misconfigurations in security protocols, login credentials, or network connectivity before deploying changes to production environments.

Main Features

1. The tool offers real-time SMTP connection testing with live terminal-style logs, displaying server responses at each step of the handshake process, including EHLO, STARTTLS, and AUTH PLAIN commands. Users can test across standard ports (25, 465, 587) with support for TLS/SSL encryption protocols.
2. Preconfigured templates for major providers like Gmail, Microsoft 365, and SendGrid simplify testing by auto-populating server addresses, ports, and security requirements. Custom configurations allow testing of on-premise servers or specialized SMTP relays.
3. A secure testing environment ensures credentials are never stored, with ephemeral sessions that terminate immediately after diagnostics. The "Send Test Email" option validates end-to-end delivery after successful authentication.

Problems Solved

1. The tool eliminates guesswork in diagnosing SMTP-related failures such as blocked ports, incorrect TLS settings, or invalid credentials, which commonly cause email delivery failures in services like Office 365 or AWS SES.
2. It serves developers, system administrators, and DevOps teams responsible for maintaining email infrastructure, as well as non-technical users configuring CRM or marketing platforms requiring SMTP integration.
3. Typical scenarios include validating new server deployments, troubleshooting email client configuration errors, or auditing third-party SMTP services for compliance with security standards like SPF/DKIM.

Unique Advantages

1. Unlike command-line tools like Telnet or OpenSSL, SMTP‑Test.com provides a browser-based interface with interpreted error messages, eliminating the need to manually decode SMTP response codes or analyze packet captures.
2. The tool uniquely combines port scanning, protocol negotiation analysis, and test email delivery in a single workflow, offering deeper diagnostics than basic "server reachability" checkers.
3. Competitive differentiation comes from zero registration requirements, immediate access to raw SMTP logs, and side-by-side comparisons of recommended settings for 15+ major email providers.

Frequently Asked Questions (FAQ)

1. Is my SMTP password stored when using this tool? No credentials are persisted beyond the active testing session, and all data is transmitted over encrypted HTTPS connections to prevent interception.
2. Can I test SMTP servers behind corporate firewalls? The tool requires outbound internet access to your SMTP server on specified ports; firewall rules may need adjustment to allow temporary connections from our diagnostic servers.
3. Why does my Gmail test fail even with correct credentials? Google often requires app-specific passwords for SMTP when 2FA is enabled; ensure you're using one rather than your primary account password.
4. How long does the test email take to arrive? Delivery typically occurs within 10-30 seconds if configured correctly, but delays may indicate greylisting or spam filtering by the recipient's server.
5. Does this support SMTP AUTH with OAuth2? Current version focuses on PLAIN authentication; OAuth2 support is planned for future updates to accommodate modern Office 365 configurations.