SMTP Configuration Tester

Test and validate your SMTP email configurations with ease

SMTP Configuration

Please provide a SMTP host.
Your mail server address
Please provide a valid port number.
The port your mail server uses for SMTP
Please provide a username.
Authentication username for your mail server
Please provide a password.
Authentication password for your mail server
Please select an encryption type.
Security protocol for SMTP connection
Please provide a sender name.
How the recipient will see who sent the email
Please provide a valid email address.
The email address the test will be sent from
Please provide a valid recipient email address.
Where the test email will be delivered
Show detailed connection information

SMTP Host smtp.gmail.com
SMTP Port 587 (TLS) or 465 (SSL)
Encryption TLS or SSL
Username Your full Gmail address
Password Your Gmail password or app password
Note: You may need to create an app password if you have 2FA enabled

SMTP Host smtp.office365.com
SMTP Port 587
Encryption TLS
Username Your full email address
Password Your email password

SMTP Host smtp.mail.yahoo.com
SMTP Port 587 or 465
Encryption TLS or SSL
Username Your full Yahoo email
Password Your app password
Note: Yahoo requires using an app password

  • Unable to connect to SMTP server

    Verify host and port are correct. Check your firewall settings and internet connection.

  • Connection timeout

    The server might be down or your network might be blocking the connection. Try a different port or contact your network administrator.

  • SSL/TLS certificate verification failed

    Ensure you're using the correct encryption type. Some servers require specific SSL/TLS settings.

  • Authentication failed

    Double-check your username and password. For Gmail and other services with enhanced security, you may need to use an app password.

  • Account login denied

    Some providers require you to allow "less secure apps" or create specific app passwords for SMTP access.

  • Username and password not accepted

    Make sure your account isn't locked due to too many failed attempts. Check if you need to use your full email as username.

  • Sender address rejected

    Your sender email must match your authentication email or be authorized by the domain.

  • Recipient address rejected

    Check if the recipient email address is valid and correctly formatted.

  • Sending limit exceeded

    Many email providers have daily sending limits. Check your provider's policy.

  • Message blocked for spam content

    Your test message might be flagged as spam. Try a different subject or content.

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