karolyi/py3-validate-email
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cache the mx from the cache since it's very unlikely to change and we

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can spare many DNS requests
This commit is contained in:
Andrea Crotti 2014-01-07 11:51:50 +00:00
parent 46746dc237
commit a6a10744aa
1 changed files with 10 additions and 1 deletions
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11
validate_email.py
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@ -85,6 +85,15 @@ ADDR_SPEC = LOCAL_PART + r'@' + DOMAIN # see 3.4.1
# A valid address will match exactly the 3.4.1 addr-spec. # A valid address will match exactly the 3.4.1 addr-spec.
VALID_ADDRESS_REGEXP = '^' + ADDR_SPEC + '$' VALID_ADDRESS_REGEXP = '^' + ADDR_SPEC + '$'
MX_DNS_CACHE = {}
def get_mx_ip(hostname):
if hostname not in MX_DNS_CACHE:
MX_DNS_CACHE[hostname] = DNS.mxlookup(hostname)
return MX_DNS_CACHE[hostname]
def validate_email(email, check_mx=False, verify=False, debug=False): def validate_email(email, check_mx=False, verify=False, debug=False):
"""Indicate whether the given string is a valid email address """Indicate whether the given string is a valid email address
@ -109,7 +118,7 @@ def validate_email(email, check_mx=False, verify=False, debug=False):
'have installed pyDNS python package') 'have installed pyDNS python package')
DNS.DiscoverNameServers() DNS.DiscoverNameServers()
hostname = email[email.find('@') + 1:] hostname = email[email.find('@') + 1:]
mx_hosts = DNS.mxlookup(hostname) mx_hosts = get_mx_ip(hostname)
for mx in mx_hosts: for mx in mx_hosts:
try: try:
smtp = smtplib.SMTP() smtp = smtplib.SMTP()