How to Check if Your SMTP Port Is Open: Easy Methods Explained

Name: How to Check if Your SMTP Port Is Open: Easy Methods Explained
Uploaded: 2026-07-12T00:00:00Z
Duration: 36 s
Description: Learn simple ways to check if your SMTP port (e.g., port 25) is open using telnet or online port scanner tools.

Learn simple ways to check if your SMTP port (e.g., port 25) is open using telnet or online port scanner tools.

Published Jul 12, 2026

Video transcript

To check if your SMTP port is open, you can use the following methods: 1. Use the command `telnet yourdomain.com 25` in the Command Prompt or Terminal. Replace `25` with the SMTP port number. 2. Utilize online tools like port scanner services. If the connection is successful, the port is open; if not, it may be blocked.

Questions and answers

What is the default SMTP port number?
The default SMTP port is 25, commonly used for sending emails between servers.
How can I test if my SMTP port is blocked?
You can test if your SMTP port is blocked by using the telnet command or online port scanner tools to attempt a connection.
Why might an SMTP port be closed or blocked?
An SMTP port might be closed due to firewall settings, ISP restrictions, or incorrect server configurations that prevent email sending.