pcmNf4kn

1import sys
2import re
3import dns.resolver   # Requires dnspython
4
5email_host_regex = re.compile(".*@(.*)$")
6gmail_servers_regex = re.compile("(.google.com.|.googlemail.com.)$", re.IGNORECASE)
7
8def is_gmail(email):
9        """ Returns True if the supplied Email address is a @gmail.com Email or is a Google Apps for your domain - hosted Gmail address
10Checks are performed by checking the DNS MX records """
11        m = email_host_regex.findall(email)
12        if m and len(m) > 0:
13                host = m[0]
14                if host and host != '':
15                        host = host.lower()
16
17                if host == "gmail.com":
18                        return True
19                else:
20                        answers = dns.resolver.query(host, 'MX')
21                        for rdata in answers:
22                                m = gmail_servers_regex.findall(str(rdata.exchange))
23                                if m and len(m) > 0:
24                                        return True
25
26        return False
27
28print is_gmail("xxx@gmail.com")