Enumerate stmp users

smtp_user_enum.py

import smtplib


users_fp = "/usr/share/seclists/Usernames/top-usernames-shortlist.txt"

with open(users_fp, "r") as f:
    for user in f:
        email = f"{user.strip()}@mail.example.org"
        try:
            smtp = smtplib.SMTP("mail.example.org", 25)
            smtp.ehlo()
            smtp.mail("[email protected]")
            resp = smtp.rcpt(email)
            print(resp)
            if resp[0] == 250:
                print(f"Found: {email}")
        finally:
            smtp.quit()