SMTP Tester

Test your connection to Sendgrid, Mailgun, Amazon SES, Gmail, or any SMTP server. See the exact SMTP conversation to help you troubleshoot email issues.

Quick Presets

SMTP Configuration

SMTP Host *

Port *

Encryption

Username *

Password *

Test Email Details

From Email *

From Name

To Email *

Subject

Message

How to Use

•Choose a preset or enter your SMTP server details manually
•Enter your authentication credentials (username/password)
•Provide test email details (from/to addresses)
•Click "Test SMTP Connection" to verify your configuration
•Review the SMTP conversation log to troubleshoot issues

Note: Your credentials are only used for testing and are not stored anywhere.

Common SMTP Ports

Standard SMTP

Unencrypted (often blocked by ISPs)

587

STARTTLS (Recommended)

Modern standard with TLS encryption

465

SSL/TLS

Legacy SSL (SMTPS)