如何使用Python验证电子邮件是否有效和可用

Question

我正在尝试使用python验证一些电子邮件，除了那些与我自己的电子邮件服务器匹配的电子邮件之外，我一直在获取所有电子邮件

import re
import smtplib
import dns.resolver
import socket
import smtplib

# Address used for SMTP MAIL FROM command  
fromAddress = 'fromMyEmail@mydomain.com'#

input = open("input.txt", "r")
output = open("output.txt", "w+")

# Simple Regex for syntax checking
regex = '^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,})$'

_VALID = 'VALID'
_IN_VALID = 'IN_VALID'

output.write('{}\t{}\t{}\t{}\t{}\n'.format('email', 'domain', 'code', 'message', 'is_valid'))

for inputAddress in input.readlines():

    print('parsing ', inputAddress)

    try:
        code = 0
        message = None
        # SMTP lib setup (use debug level for full output)
        server = smtplib.SMTP()
        server.set_debuglevel(0)
        addressToVerify = str(inputAddress)

        # Syntax check
        match = re.match(regex, addressToVerify)
        if match == None:
            print('Bad Syntax')
            raise ValueError('Bad Syntax')

        # Get domain for DNS lookup
        splitAddress = addressToVerify.split('@')
        domain = str(splitAddress[1])
        print('Domain:', domain)

        # MX record lookup
        records = dns.resolver.query(domain, 'MX')
        print('exchanging')
        mxRecord = records[0].exchange
        mxRecord = str(mxRecord)
        print('mxRecord ', mxRecord)

        # SMTP Conversation
        server.connect(mxRecord)
        server.helo(server.local_hostname)  ### server.local_hostname(Get local server hostname)
        server.mail(fromAddress)
        code, message = server.rcpt(str(addressToVerify))
        server.quit()

        if code == 250:
            output.write(
                '{}\t{}\t{}\t{}\t{}\n'.format(addressToVerify.strip(), domain.strip(), code, str(message).strip(),
                                              _VALID))
        else:
            output.write(
                '{}\t{}\t{}\t{}\t{}\n'.format(addressToVerify.strip(), domain.strip(), code, str(message).strip(),
                                              _IN_VALID))

    except Exception as e:
        output.write('{}\t{}\t{}\t{}\t{}\n'.format(addressToVerify.strip(), domain, -1, str(e).strip(), _IN_VALID))

output.close()

但我一直得到错误[Errno 111] Connection refused