Test your SMTP server to confirm connection, authentication, and SSL/TLS support.
Quickly check whether your SMTP server can connect, authenticate, and send emails using the correct port and encryption before sending production traffic.
The most commonly used SMTP ports are 25, 465 (SSL), and 587 (TLS). Your email provider or server configuration usually specifies the correct port and encryption method.
This SMTP test focuses on server connectivity and authentication. To analyze spam filtering and inbox placement, use additional tools such as Mail Tester, SPF, DKIM, and DMARC checkers.
Yes. This tool only checks connectivity and authentication. It does not send real emails to recipients or store message content.
An SMTP test verifies the basic functionality of an SMTP server by attempting a real connection using the provided host, port, and authentication details. It helps identify common problems such as incorrect login credentials, blocked ports, unsupported encryption methods, or server connectivity issues.
SMTP authentication is a process that verifies the identity of a user or application before allowing it to send emails through an SMTP server. It usually requires a username and password and helps prevent unauthorized email sending and spam.
The recommended SMTP port for sending emails is 587 with STARTTLS encryption.Port 465 is used for SMTP over implicit SSL/TLS, while port 25 is typically reserved for server-to-server communication and is often blocked by ISPs.
An SSL handshake failure usually occurs when the SMTP client and server cannot agree on encryption settings. This may be caused by using the wrong port, an unsupported TLS version, or a mismatch between SSL and STARTTLS configuration.
Yes, SSL/TLS is strongly recommended to encrypt email credentials and message content during transmission.
