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Checking Port 25 for SMTP Email Service in Windows 10

February 04, 2025Technology4345
How to Check if Port 25 is Open in Windows 10 Port 25 is a critical po

How to Check if Port 25 is Open in Windows 10

Port 25 is a critical port used for Simple Mail Transfer Protocol (SMTP) email services. This article guides you through the process of checking if your Windows 10 system has port 25 open, which is essential for ensuring your email server functions properly.

1. Using Telnet Command

The most straightforward way to check if port 25 is open is by using the command line tool Telnet. Here’s how to do it:

Open the Command Prompt in Windows 10 (you can do this by pressing the Windows key R, typing cmd in the ldquo;Runrdquo; dialog box, and pressing Enter). In the Command Prompt, type the following command:

telnet [hostname] 25

If the port is open, you would see a successful connection window. If not, you would receive a generic access denied error message.

2. Using PortQry.exe

PortQry.exe is another useful tool for checking if port 25 is open. It’s typically installed on another machine, and you can use it to query the specified port (port 25 in this case).

Install PortQry.exe on another machine that can communicate with your Windows 10 system. Open the Command Prompt on the machine with PortQry.exe installed. Run the following command, replacing [IP address] with the IP address of the Windows 10 system:

portqry.exe -p TCP -n [IP address] -e 25

If the port is open, you will receive a response indicating that it is listening. If the port is closed, you will receive a response indicating that the port is not listening.

3. Using Netstat Command

Netstat is a command-line tool available on Windows operating systems that displays network connections, routing tables, interface statistics, masquerade connections, and other network-related information. Here's how you can use it to check if port 25 is open:

Press the Windows key R to open the Run dialog box, type cmd in the ldquo;Runrdquo; dialog box, and press Enter. This opens the Command Prompt. In the Command Prompt, type the following command:

netstat -aon | findstr "[port number]">br>

If the port is open, the Command Prompt will display information about the port, including the listening status. If the port is closed, you will see no relevant information.

Conclusion

Ensuring that port 25 is open on your Windows 10 system is crucial for the proper functioning of your SMTP email service. By following the methods outlined above, you can easily check if port 25 is open and take appropriate action if necessary.