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Useful Python script to know if an email address exists, based on Inti's Medium post https://medium.com/intigriti/abusing-autoresponders-and-email-bounces-9b1995eb53c2
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#!/usr/bin/python3 | |
# Example usage: ./does_email_address_exist.py twitter.com jack | |
import argparse | |
from smtplib import SMTP | |
import dns.resolver | |
parser = argparse.ArgumentParser() | |
parser.add_argument('hostname') | |
parser.add_argument('user') | |
args = parser.parse_args() | |
hostname = args.hostname | |
user = args.user | |
mx_records = dns.resolver.query(hostname, 'MX') | |
server = str(mx_records[0].exchange) | |
with SMTP(server, local_hostname=hostname) as smtp: | |
smtp.helo() | |
smtp.docmd('mail from: <something@something.com>') | |
code, text = smtp.docmd('rcpt to: <'+user+'@'+hostname+'>') | |
if code == 550: | |
print('it does not') | |
else: | |
print('it does exist') |
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