smtp-valid-tester
There are 2 repositories under smtp-valid-tester topic.
Tux-MacG1v/Mess-SMTP-Checker
MASS SMTP VALID INVALID CHECKER.
Aymen-XH/Smtp-Checker
This simple SMTP server scanning tool allows you to test a list of SMTP servers for connectivity. It checks whether a connection can be established using the provided credentials and saves the details of live SMTP servers to a file.