smtp-user-enum -m 4 -M RCPT -U target_emails.txt -T mxlist.txt Unknown option: T smtp-user-enum v1.2 ( http://pentestmonkey.net/tools/smtp-user-enum )
smtp-user-enum -m 4 -M RCPT -U target_emails.txt -T mxlist.txt
Unknown option: T
smtp-user-enum v1.2 ( http://pentestmonkey.net/tools/smtp-user-enum )