Verify your outgoing email server settings. Test connectivity, authentication, and send capability to ensure reliable email delivery.
Verify your email server settings and authentication credentials
Test your SMTP configuration and verify your email sending capabilities
Connection Testing
Verify server connectivity, response time, and SSL/TLS configuration
Secure Authentication
Test your credentials and detect supported authentication methods
Email Authentication
Check your SPF, DKIM, and DMARC records for better email deliverability
Test Email Sending
Send a test email to verify your full email delivery pipeline
SMTP (Simple Mail Transfer Protocol) is the standard protocol for sending emails across the Internet. It's what enables your email client or application to send messages to recipients through your email provider's servers.
According to research, 21% of legitimate emails never reach the inbox due to incorrect SMTP configuration and missing authentication. Proper setup can significantly improve your delivery rates.
Proper SMTP configuration ensures your emails actually reach recipients' inboxes instead of being blocked or sent to spam folders.
Secure SMTP settings prevent email spoofing and protect your domain reputation. TLS encryption keeps email content private during transmission.
For businesses, proper SMTP setup translates to higher open rates for marketing emails, reliable delivery of transactional emails, and improved customer communication.
Correctly configured SMTP helps maintain a positive sender reputation, which is crucial for long-term email deliverability across all recipient servers.
Comprehensive analysis of your email sending infrastructure in three simple steps
Provide your server details, port, username, and password to begin configuration testing
Our system tests connection, authentication, and DNS records to validate your setup
Review detailed analysis, actionable recommendations, and optionally send a test email
Our tool identifies and helps you fix these critical email sending infrastructure problems
Incorrect username/password combinations or outdated authentication methods that prevent successful connection to SMTP servers.
Insecure connections without TLS/SSL that expose email content and credentials to potential interception.
Using wrong ports (like port 25 when it's blocked by ISPs) or mismatching port and encryption settings.
Incomplete SPF, DKIM, or DMARC records that hurt deliverability by failing to authenticate your sending domain.
Misconfigured sending limits that cause emails to be rejected or queued, delaying important messages.
Networking issues, firewalls, or IP blocklists preventing successful connection to SMTP servers.
Use our SMTP Configuration Checker to verify your email server settings, fix issues, and ensure reliable email delivery.