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SMTP
Port 25 / 465 / 587Misc
Mail transfer — enumerate users via VRFY/EXPN/RCPT, test open relay.
// methodology checklist
Step-by-step commands
1
Service scan
howlsec@kali·shell
nmap -p25,465,587 -sV -sC $thowlsec@kali·shell
nmap -p25 --script smtp-commands,smtp-enum-users,smtp-open-relay $t2
User enumeration
howlsec@kali·shell
smtp-user-enum -M VRFY -U users.txt -t $thowlsec@kali·shell
smtp-user-enum -M RCPT -U users.txt -t $t