hqENrt7L

1import re
2import dns.resolver   # Requires dnspython
3
4email_host_regex = re.compile(".*@(.*)$")
5gmail_servers_regex = re.compile("(.google.com.|.googlemail.com.)$", re.IGNORECASE)
6
7def is_gmail(email):
8        """ Returns True if the supplied Email address is a @gmail.com Email or is a Google Apps for your domain - hosted Gmail address
9Checks are performed by checking the DNS MX records """
10        m = email_host_regex.findall(email)
11        if m and len(m) > 0:
12                host = m[0]
13                if host and host != '':
14                        host = host.lower()
15
16                if host == "gmail.com":
17                        return True
18                else:
19                        try:
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                        except dns.resolver.NXDOMAIN:
26                                return False
27
28        return False
29
30print(is_gmail("user@foodomain223.com"))