This Python script checks if the SMTP port 25 is open on a list of IP addresses. It reads IP addresses from a text file and reports whether each IP can be connected to on port 25.

• Python 3.x
• smtplib and socket libraries (both are included in the Python standard library)

1. Clone the repository or download the script file.

2. Ensure you have Python 3.x installed on your system.

1. Create a text file containing the list of IP addresses you want to check, with one IP address per line. For example:

   192.168.1.1
   10.0.0.1
   172.16.0.1
   

2. Run the script from the command line, passing the path to your text file as an argument:

   python smtpbeacon.py path/to/ip_list.txt

   Replace path/to/ip_list.txt with the actual path to your text file.

Given a text file ips.txt with the following content:

192.168.1.1
10.0.0.1
172.16.0.1

Run the script:

python smtpbeacon.py ips.txt

Output:

192.168.1.1: Open
10.0.0.1: Closed
172.16.0.1: Open