ismtp

root@kali:~# ismtp -h

 Error: option -h requires argument

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  iSMTP v1.6 - SMTP Server Tester, Alton Johnson (alton.jx@gmail.com)
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 Usage: ./iSMTP.py <OPTIONS>

 Required:

	-f <import file>	Imports a list of SMTP servers for testing.
				(Cannot use with '-h'.)
	-h <host>		The target IP and port (IP:port).
				(Cannot use with '-f'.)

 Spoofing:

	-i <consultant email>	The consultant's email address.
	-s <sndr email>		The sender's email address.
	-r <rcpt email>		The recipient's email address.
	   --sr <email>		Specifies both the sender's and recipient's email address.
	-S <sndr name>		The sender's first and last name.
	-R <rcpt name>		The recipient's first and last name.
	   --SR <name>		Specifies both the sender's and recipient's first and last name.
	-m			Enables SMTP spoof testing.
	-a			Includes .txt attachment with spoofed email.

 SMTP enumeration:

	-e <file>	Enable SMTP user enumeration testing and imports email list.
	-l <1|2|3>	Specifies enumeration type (1 = VRFY, 2 = RCPT TO, 3 = all).
			(Default is 3.)

 SMTP relay:

	-i <consultant email>	The consultant's email address.
	-x			Enables SMTP external relay testing.

 Misc:

	-t <secs>	The timeout value. (Default is 10.)
	-o		Creates "ismtp-results" directory and writes output to
			ismtp-results/smtp_<service>_<ip>(port).txt

 Note: Any combination of options is supported (e.g., enumeration, relay, both, all, etc.).