Count how many top 1 million Alexa sites do not have MX records set

alexa_mx.py

import dns.resolver
from tomorrow import threads


@threads(100)
def mx(id_, domain):
    try:
        dns.resolver.query(domain, 'MX')
        return False
    except dns.resolver.NoAnswer:
        print '[{}] Found domain without MX: {}'.format(id_, domain)
        return True
        

if __name__ == "__main__":
    with open('top.csv') as f:
        results = [mx(line.strip('\n').split(',')[0], line.strip('\n').split(',')[1]) for line in f.readlines()]
        print results.count(True)