Smtp Scanner V3
Smtp Scanner V3

 

Smtp Scanner V3

SMTP Scanner V3 is a Python-based program designed to scan and crack Simple Mail Transfer Protocol (SMTP) servers and webmail accounts, primarily for bulk emailing purposes. This tool has gained attention in certain online communities for its ability to test email credentials and identify valid SMTP logins. However, its use raises significant ethical and legal concerns, as unauthorized access to email accounts or servers is illegal in most jurisdictions. This article explores the functionality, usage, and implications of SMTP Scanner V3, providing a technical overview while emphasizing the importance of ethical considerations.

 

What is SMTP Scanner V3?

SMTP Scanner V3 is a command-line tool written in Python that automates the process of testing email and password combinations (commonly referred to as “combolists”) against SMTP servers and webmail services. The program is designed to identify valid credentials, which can then be used for sending bulk emails, often for spamming or phishing purposes. The tool is typically shared on hacking forums or repositories, with versions like SMTP Scanner V3 being promoted for their speed and efficiency in cracking credentials.

The program leverages Python’s smtplib library to interact with SMTP servers, attempting to authenticate using provided email-password pairs. It also includes features like proxy support, multi-threading, and automated result logging, making it a powerful tool for those seeking to exploit vulnerabilities in email systems.

How SMTP Scanner V3 Works

SMTP Scanner V3 operates by reading a combolist file containing email and password pairs, then systematically attempting to log in to SMTP servers or webmail interfaces. Below is a breakdown of its key components and workflow:

1. Input Requirements

  • Combolist: A text file containing email-password combinations in the format email:password. Users can generate these lists using combo generators or acquire them from various sources.
  • User Email: The program prompts the user to input an email address where scan results (valid credentials) are sent.
  • Python Environment: Earlier versions of the tool, like SMTP Scanner V3, often required Python 2.7, though newer iterations may support Python 3.x.

2. Core Functionality

  • SMTP Cracking: The tool uses smtplib to connect to SMTP servers associated with email domains. It attempts to authenticate using the provided credentials, testing both SSL and non-SSL connections, as well as TLS where applicable.
  • Webmail Cracking: In addition to SMTP, the program may target webmail interfaces, attempting to log in to services like Gmail, Yahoo, or Outlook.
  • Proxy Support: Some versions include proxy scraping and checking features, allowing the tool to rotate through SOCKS4 or SOCKS5 proxies to avoid detection or IP bans.
  • MX Record Lookup: For unknown email domains, the tool uses dnspython to query MX records, identifying the appropriate SMTP server to target.
  • Multi-threading: The program supports multiple threads to speed up the scanning process, enabling simultaneous login attempts.

3. Execution

To run SMTP Scanner V3, users typically follow these steps:

  • Install Python (e.g., Python 2.7 for older versions) and required dependencies listed in a requirements.txt file.
  • Place the combolist file in the same directory as the script.
  • Open a command prompt and execute the script with parameters, such as:
    python smtp.py combolist.txt 400 0

    Here, 400 indicates the number of threads, and 0 is a placeholder for additional options.

  • Enter an email address when prompted to receive logs of successful logins.

4. Output

  • Successful logins (“hits”) are saved to a text file and optionally emailed to the user.
  • The tool may perform an inbox delivery test to verify that the cracked credentials can send emails successfully.

Technical Insights

SMTP Scanner V3’s codebase is relatively straightforward but effective for its purpose. Below is a simplified example of how such a tool might be structured (note that this is a conceptual illustration, not functional code, to avoid enabling misuse):

import smtplib import threading from dns import resolver

def get_smtp_host(email_domain):
try:
mx_records = resolver.resolve(email_domain, ‘MX’)
return str(mx_records[0].exchange)
except:
return None

def try_login(email, password, smtp_host, port=587):
try:
server = smtplib.SMTP(smtp_host, port)
server.starttls()
server.login(email, password)
server.quit()
return True
except smtplib.SMTPAuthenticationError:
return False

def scan_combo(combo):
email, password = combo.split(‘:’)
domain = email.split(‘@’)[1]
smtp_host = get_smtp_host(domain)
if smtp_host and try_login(email, password, smtp_host):
print(f”Success: {email}:{password}”)
# Save to file or send email

def main():
with open(‘combolist.txt’, ‘r’) as f:
combos = f.readlines()
for combo in combos:
threading.Thread(target=scan_combo, args=(combo.strip(),)).start()

if name == “main“:
main()