SMTPTester is a python3 tool to test SMTP server for 3 common vulnerabilities:

• Spoofing - The ability to send a mail on behalf of an internal user
• Relay - Using this SMTP server to send email to other address outside of the organization
• user enumeration - using the SMTP VRFY command to check if specific username and\or email address exist within the organization.

How to use it
First, install the needed dependencies:

pip install -r requirments.txt

Second, run the tool with the needed flags:

python SMTPTester.py --tester [tester email] --targets [SMTP IP or file containing multiple IPs]

Options to consider

• -i\--internal
  • testing only for mail spoofing
• -e\--external
  • only testing for mail relay
• -v\--vrfy
  • only perform user enumeration the tool will perform both internal and external when no specific test type is specified, and will append the output to a log file on the same folder as the SMTPTester.py file.

Issues, bugs and other code-issues
Yeah, I know, this code isn't the best. I'm fine with it as I'm not a developer and this is part of my learning process. If there is an option to do some of it better, please, let me know.
Not how many, but where.
v0.1