About this Tool 🛠️
A dedicated online utility to test SMTP email server connections. It connects to mail servers using TLS/SSL or plain connections, verifies SSL certificates, and authenticates using provided credentials without sending an actual email.
Benefits of Using This Tool 🌟
- Comprehensive Testing: Supports common mail ports including 25, 465, and 587.
- Protocol Specific: Tests STARTTLS negotiation and direct SSL wrappers natively.
- Secure: Credentials are transient and never logged in our systems.
- Detailed Output: Provides exact error messages directly from the mail server context (e.g., Auth failed, relay denied).
Why Use This Tool? ✨
- Email Setup: Verify credentials before entering them into an email client or application configuration.
- Diagnose SMTP Issues: Determine if your host port is blocked or if authentication parameters are failing.
- Test Third-Party Services: Perfect for validating SendGrid, Mailgun, Amazon SES, or Google Workspace SMTP settings.
- Save Time: Avoid the absolute hassle of writing terminal test scripts just to verify an SMTP login.
Frequently Asked Questions (FAQs) ❓
Q: Does this tool send a test email?
A: No, it strictly connects, upgrades to TLS if necessary, authenticates, and gracefully disconnects. No emails are sent.
Q: What port should I use?
A: Generally, use 587 with STARTTLS for modern submission, or 465 for implicit SSL. Port 25 is often blocked by residential ISPs.
Q: Why did authentication fail with Google Workspace?
A: You heavily likely need to generate an "App Password" in your Google account settings, as standard passwords are not accepted via basic SMTP anymore.
Q: Are my SMTP credentials kept private?
A: Yes, they are only used to initiate the test operation and are immediately destroyed from memory.