Answer / Saurabh Tripathi

To check if port 25 (SMTP) is open, you can use various tools such as Telnet or nmap. Here's how to use each:

- Using Telnet: Open Terminal, enter the following command, and replace `<IP_address>` with your target's IP address:

```
telnet <IP_address> 25
```

- If the connection is successful, it means that port 25 is open. If you get a connection refused message or timeout error, then the port is most likely closed.

- Using nmap: Run this command to check the status of port 25.

```
nmap -p 25 <IP_address>
```

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