Proxies for email marketing

# pip install requests dnspython PySocks
import random, smtplib, socks, requests
import dns.resolver
from concurrent.futures import ThreadPoolExecutor

PROXY_LIST_URL = "PROXY_LIST_URL_FROM_DASHBOARD"
THREADS = 2100
HELO_DOMAIN = "yourdomain.com"
FROM_ADDR = "check@yourdomain.com"

proxies = [line.strip() for line in requests.get(PROXY_LIST_URL, timeout=15).text.splitlines() if ":" in line]

class ProxySMTP(smtplib.SMTP):
    def __init__(self, proxy, host, port=25, timeout=15):
        self.proxy = proxy
        super().__init__(host, port, timeout=timeout)

    def _get_socket(self, host, port, timeout):
        proxy_host, proxy_port = self.proxy.split(":")
        sock = socks.socksocket()
        sock.set_proxy(socks.SOCKS5, proxy_host, int(proxy_port))
        sock.settimeout(timeout)
        sock.connect((host, port))
        return sock

def mx(domain):
    records = dns.resolver.resolve(domain, "MX")
    return str(min(records, key=lambda r: r.preference).exchange).rstrip(".")

def check(email):
    try:
        smtp = ProxySMTP(random.choice(proxies), mx(email.split("@")[1]))
        smtp.ehlo(HELO_DOMAIN)
        smtp.mail(FROM_ADDR)
        code, _ = smtp.rcpt(email)
        smtp.quit()
        return email, "valid" if code == 250 else "invalid"
    except Exception:
        return email, "unknown"

emails = [line.strip() for line in open("emails.txt") if "@" in line]
with ThreadPoolExecutor(THREADS) as pool, open("checked.csv", "w") as out:
    for email, status in pool.map(check, emails):
        out.write(f"{email};{status}\n")
        print(email, status)