Professional SMTP Test Tool for Email Server Diagnostics
Comprehensive SMTP testing tool with advanced diagnostics, real-time monitoring, and detailed reporting. Test any SMTP server configuration with professional-grade accuracy.
Multi-Protocol Support
Our SMTP test tool supports all authentication methods including PLAIN, LOGIN, CRAM-MD5, and more
SSL/TLS Testing
Test both SSL/TLS and STARTTLS connections with certificate validation and encryption verification
Detailed Diagnostics
Get comprehensive diagnostic reports with error analysis, suggestions, and performance metrics
Performance Monitoring
Track connection times, command latency, and overall SMTP server performance
Email Delivery Testing
Send actual test emails to verify end-to-end delivery and check inbox placement
Configuration Presets
Quick-start templates for Gmail, Office 365, SendGrid, Amazon SES, and other popular providers
1Configure Connection Settings
Start by entering your SMTP server details in the test tool:
- •Server Host: Enter your SMTP server hostname (e.g., smtp.gmail.com)
- •Port: Select the appropriate port (587 for STARTTLS, 465 for SSL/TLS)
- •Security: Choose encryption method (Auto, SSL/TLS, STARTTLS, or None)
2Add Authentication Credentials
If your SMTP server requires authentication, provide your credentials:
- •Username: Your SMTP username (often your full email address)
- •Password: Your SMTP password or app-specific password
- •Note: Credentials are only used temporarily and never stored
3Run the Test and Analyze Results
Click the test button and watch the real-time output:
- •Monitor SMTP command execution in the terminal window
- •Review server responses and any error messages
- •Analyze diagnostic suggestions for fixing any issues
Web Developers
- →Test SMTP configuration in applications
- →Debug email sending functionality
- →Verify email server credentials
- →Test before production deployment
System Administrators
- →Monitor mail server health
- →Validate server configuration changes
- →Troubleshoot delivery issues
- →Verify SSL/TLS certificates
Email Marketers
- →Test email service providers
- →Verify SMTP relay services
- →Check deliverability settings
- →Monitor campaign infrastructure
Gmail SMTP
Host: smtp.gmail.com
Port: 587
Office 365
Host: smtp.office365.com
Port: 587
Amazon SES
Host: email-smtp.region.amazonaws.com
Port: 587
SendGrid
Host: smtp.sendgrid.net
Port: 587
Mailgun
Host: smtp.mailgun.org
Port: 587
Postmark
Host: smtp.postmarkapp.com
Port: 587
Yahoo Mail
Host: smtp.mail.yahoo.com
Port: 587
Custom SMTP
Host: your-server.com
Port: 25/587/465
Start Testing Your SMTP Server
Use our professional SMTP test tool to diagnose email server issues, verify configurations, and ensure reliable email delivery.
Launch SMTP Test Tool