inc_mxlookup.py

#!/usr/local/opt/python@3.8/bin/python3
# -*- coding: utf-8 -*-

__author__ = 'DrPython3'
__date__ = '2021-12-04'
__version__ = '1.1'
__contact__ = 'https://github.com/DrPython3'

'''
--------------------------------------------
Functions for Reading MX Records of a Domain
--------------------------------------------

Part of << Mail.Rip V3: https://github.com/DrPython3/MailRipV3 >>
'''

# [IMPORTS]
# ---------

import sys
import socket
import dns.resolver
from inc_etc import domain_verification

# [FUNCTIONS]
# -----------

def get_host(default_timeout, email):
    '''
    Checks the DNS records of an email-domain for MX infos and returns any found SMTP URI.

    :param float default_timeout: connection timeout
    :param str email: email with domain to check
    :return: found (True, False), smtp_host (SMTP URI)
    '''
    # set variables and stuff:
    socket.setdefaulttimeout(default_timeout)
    found = False
    smtp_host = str('none')
    smtp_domain = str(email.split('@')[1])
    get_records = dns.resolver.Resolver(configure=False)
    # using Google DNS, replace on purpose:
    get_records.nameservers = ['8.8.8.8']
    records = get_records.resolve(smtp_domain, 'MX')
    counter = 0
    # extract host from records:
    while found == False:
        try:
            possible_host = str(records[counter]).split(' ')[1].rstrip('.')
            verify_domain = domain_verification(possible_host)
            if verify_domain == True:
                smtp_host = possible_host
                found = True
            else:
                counter += 1
        except:
            break
    return found, smtp_host

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