It can search for SMTP server also locates and identifies open relay SMTP servers. It is an all in one program, you tell it how to scan and it does ALL of the work for you. (Website: http://www.cirt.dk/tools/).
First we have to edit the configuration file host_info.txt and put information of the e-mail server we want to scan. In this example I will use nano to edit the configuration file.
After editing the configuration file we just issue the command which is very simple:
RelayScanner.pl -l host_info.txt
What happened over here is that Relayscanner sent fake internal e-mail to the target and prompted the ping-back response from the reciepient. Only after getting response does Relayscanner continues sending more. That 16416 in total !! under default conditions.
RelayScanner has other options and scopes for using built-in plugins. List of options:
That’s all! Thanks for reading.