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smtp.md

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SMTP

Enumeration and vuln scanning

sudo nmap --script smtp* -p25 10.10.10.4

Command to check if a user exists

VRFY root

created a script as well called smtp.py to automate the checking if a user exists. /home/kali/offsec/tools/

Command to ask the server if a user belongs to a mailing list

EXPN root

Brute-force

hydra -P /usr/share/wordlistsnmap.lst $ip smtp -V

Windows

Test-NetConnection -Port 25 192.168.50.8

install telnet on windows
dism /online /Enable-Feature /FeatureName:TelnetClient
telnet 192.168.50.8 25