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Check if an Email address is Gmail or Google Apps for your domain
import sys
import re
import dns.resolver # Requires dnspython
email_host_regex = re.compile(".*@(.*)$")
gmail_servers_regex = re.compile("(|$", re.IGNORECASE)
def is_gmail(email):
""" Returns True if the supplied Email address is a Email or is a Google Apps for your domain - hosted Gmail address
Checks are performed by checking the DNS MX records """
m = email_host_regex.findall(email)
if m and len(m) > 0:
host = m[0]
if host and host != '':
host = host.lower()
if host == "":
return True
answers = dns.resolver.query(host, 'MX')
for rdata in answers:
m = gmail_servers_regex.findall(str(
if m and len(m) > 0:
return True
return False
print is_gmail("")
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pcreytens commented Nov 1, 2012

You should change line 6 to: gmail_servers_regex = re.compile("(||$", re.IGNORECASE)
Some Google Apps domains use Postini.

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