![]() Type following command to enumerate valid email ID of targeted server: ismtp -h 192.168.1.107:25 -e /root/Desktop/email.txt ISMTP is the Kali Linux tool which is used for testing SMTP user enumeration (RCPT TO and VRFY), internal spoofing, and relay. D: dom Domain to append to supplied user list to make email addresses Use this option when you want to guess valid email addresses instead of just usernames.įrom the given image you can see it has shown is valid email ID for user raj. Type following command to verify user email address on mail server: smtp-user-enum -M VRFY -D -u raj -t 192.168.1.107 t: host Server host running SMTP serviceįrom the given image you can see out of total 7 queries only 5 names are valid and exist in SMTP server. U: file File of usernames to check via SMTP service M: mode Method to use for username guessing EXPN, VRFY or RCPT ![]() Type following command to enumerate username using a dictionary of usernames: smtp-user-enum -M VRFY -U /root/Desktop/user.txt -t 192.168.1.107 It could be adapted to work against other vulnerable SMTP daemons, but this hasn’t been done as of v1.0. Enumeration is performed by inspecting the responses to VRFY, EXPN, and RCPT TO commands. Smtp-user-enum is a tool for enumerating OS-level user accounts on Solaris via the SMTP service (sendmail). Msf auxiliary(smtp_enum) > set USER_FILE /root/Desktop/user.txtįrom the given image you can read the valid username found in the targeted server as well as it also grabs the SMTP banner. Through the implementation of these SMTP commands can reveal a list of valid users. You can guess for valid user account through the following command and if you receive response code 550 it means unknown user account: you received a message code 250,251,252 which means the server has accepted the request and user account is valid.īut if you received a message code 550 it means invalid user account as shown in given image SMTP service has two internal commands that allow the enumeration of users: VRFY (confirming the names of valid users) and EXPN (which reveals the actual address of user’s aliases and lists of e-mail (mailing lists)). Telnet telnet 192.168.1.107 25įrom the given image you can observe that it has successfully shown “220 ESMTP Postfix” has been installed on the target machine. Execute the following command and find out its version and valid user. We can also find out version and valid user of SMTP server using telnet.
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