I would love to have this tool implemented and gain feedback from other people. While there are several tools out there that either do SMTP spoofing, SMTP relaying, OR SMTP enumeration testing, there is none out there for all three.

Even for tools that conducts SMTP enumeration tests, they mostly only test either via SMTP RCPT TO or SMTP VRFY. Not both (or they don't give you the choice to choose between the two).

With this script. You can perform SMTP spoofing, SMTP relaying, and SMTP enumeration (via RCPT TO and/or VRFY) all with one line. You can do all of the tests at once, or you can only conduct a specific combination (e.g., spoofing and relay, spoofing and enum, enum and relay, etc.).

Please see screenshot.