SMTP Tester Tool
Test SMTP server connectivity and email authentication
Verify your SMTP configuration, test email delivery, and analyze 5-protocol authentication (SPF, DKIM, DMARC, MX Records, and Reverse DNS) to ensure optimal email deliverability.
SMTP Configuration & Testing
Configure your SMTP server settings and compare test modes
Server Configuration
Test Mode Comparison
Compare features between Auto and Custom modes to choose the best option for your testing needs.
| Feature | AutoRecommended | Custom |
|---|---|---|
| SMTP Testing | ||
| Authentication Analysis | 5-Protocol | |
| Custom Recipient | ||
| Recommendations | ||
| Diagnostic Logs | ||
| Test Duration | 10-30s | 5-15s |
Auto Mode
System email + 5-protocol analysis
Custom Mode
Custom recipient + SMTP test only
Setup Instructions
Quick setup guides for popular email providers
Gmail
Server: smtp.gmail.com
Port: 587 (TLS)
Auth: Use App Password
Enable 2FA and generate App Password at Google Account → Security → App Passwords
Outlook
Server: smtp-mail.outlook.com
Port: 587 (TLS)
Auth: Email & Password
Use your Outlook.com or Hotmail address. May need app password if 2FA enabled.
Yahoo
Server: smtp.mail.yahoo.com
Port: 587 (TLS)
Auth: Use App Password
Generate App Password at Yahoo Account Security → Generate app password
Security Best Practices
- • Always use App Passwords instead of your main account password
- • Enable two-factor authentication (2FA) on your email account
- • Use TLS encryption (port 587) for secure connections
- • Test with a dedicated email account, not your primary one
About SMTP Testing
Understanding SMTP connectivity and email authentication
What is SMTP Testing?
SMTP (Simple Mail Transfer Protocol) testing verifies that your email server configuration is working correctly and can successfully send emails. This includes testing server connectivity, authentication, and delivery capabilities.
Key Benefits:
- Verify SMTP server connectivity
- Test authentication credentials
- Validate email delivery
- Troubleshoot configuration issues
Email Authentication
Our auto mode analyzes 5 comprehensive email authentication protocols to ensure your emails are properly authenticated and won't be marked as spam.
5-Protocol Authentication Analysis:
- SPF - Sender Policy Framework validation
- DKIM - DomainKeys Identified Mail signatures
- DMARC - Domain-based Message Authentication
- MX Records - Mail exchange server validation
- Reverse DNS - IP address hostname verification