SMTP Test Tool | Check Email Server Configuration Online
Free online SMTP tester to verify SMTP connections, test mail servers, and diagnose email delivery issues. Perfect for Gmail, Office 365, SendGrid, and custom SMTP servers.
Your SMTP credentials are never stored and are only used temporarily for testing
Gmail SMTP Test
- Host:
- smtp.gmail.com
- Port:
- 587
- Security:
- STARTTLS
Requires App Password if 2FA enabled
Microsoft 365 SMTP
- Host:
- smtp.office365.com
- Port:
- 587
- Security:
- STARTTLS
Use your full email as username
Amazon SES SMTP
- Host:
- email-smtp.[region].amazonaws.com
- Port:
- 587
- Security:
- TLS
Requires SMTP credentials from AWS
SendGrid SMTP Relay
- Host:
- smtp.sendgrid.net
- Port:
- 587
- Security:
- TLS
Use API key as password
?Why Use an SMTP Test Tool?
Our SMTP test utility helps verify email server configurations before deploying to production. Whether you need to test SMTP connections, check SMTP server settings, or validate your SMTP relay setup, this tool provides comprehensive diagnostics for your email infrastructure.
Server Verification
- SMTP server test validation
- Connection security checks
- Authentication verification
- Port accessibility testing
Relay Testing
- SMTP relay configuration
- Mail server routing
- Message delivery verification
- Transport layer security
Benefits of Regular SMTP Testing
Using an SMTP checker regularly helps maintain email system reliability. Our SMTP testing tool provides real-time diagnostics, helping identify common issues like authentication failures, connection timeouts, or relay access problems. Whether you're setting up a new mail server or maintaining existing infrastructure, regular SMTP checks ensure optimal email delivery performance.