SMTP
Simple Mail Transfer Protocol
Check if sender could be forged with an domain user:
$ telnet mail.example.com 25
HELO example.com
MAIL FROM: <[email protected]>
Check if sender could be forged with a non-domain user:
$ telnet mail.example.com 25
HELO example.com
MAIL FROM: <[email protected]>
Check if domain users could be enumerated with VRFY and EXPN:
$ telnet mail.example.com 25
HELO example.com
Check if users could be enumerated with RCPT TO:
$ telnet mail.example.com 25
HELO example.com
MAIL FROM: <...>
DATA
From: <...>
Subject: Job offer
Hello, I would like to offer you a great job!
.
QUIT

$ ./main.py -d megacorp.com -s 10.10.13.37 -f accounts.txt -m rcptto -o valid.txt

$ smtp-user-enum -M RCPT -f '<[email protected]>' -u '<[email protected]>' -t mx.megacorp.com
$ smtp-user-enum -M RCPT -D megacorp.com -U users.txt -t mx.megacorp.com

$ swaks --to [email protected] --from [email protected] --header 'Subject: Hello, friend' --body 'Hack the Planet!' --server 192.168.1.11 --attach hello.doc
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RCPT
smtp-enum
smtp-user-enum
SPF/DKIM/DMARC
Tools
swaks