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how to check if an email exist in python?

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Valid Email address should consists of an email prefix and an email domain but both of them should be an acceptable format., Valid Email Prefix Valid Email address should consists of an email prefix and an email domain but both of them should be an acceptable format. , The above code will print False to the console as the input email address is a invalid Email address.  , The above code will print True to the console as the input email address is a valid Email address. 

Regular Expression in Python is one way that will help us find if the email address is valid or not. Creating our own Regular expression will not always be a good approach to use in this case scenario but it can help us customize our version of validation. You can learn about regular expression in python from this article which will help you how to write a good regular expression. but for our example, we will use a general regular expression that can help us to find if an email address is valid or not. 
Below is the sample code that will return true if an email address is valid or not with python regular expression.  

def isvalidEmail(email):
   pattern = "^\S+@\S+\.\S+$"
objs = re.search(pattern, email)
try:
if objs.string == email:
   return True
except:
   return False

VorNotV = isvalidEmail("haxrataligmail.com")
print(VorNotV)

To check if the email address is valid we can use the validate-email-address() method which will return true if the email address is valid otherwise it will return false. 
Step 1. Install the Third Party Python Package validate-email-address
You can install it by using pip as follows. 

pip install validate - email - address

Step 2. Install the Third Party Python Package py3dns
You can install DNS by using pip as follows. Remember the official documentation say that you have to install DNS which is an outdated Python Package and the updated version can be found here as py3dns any way you have to install it in the following way. 

pip install py3dns

The above code will print True to the console as the input email address is a valid Email address.  

from validate_email_address
import validate_email
isvalid = validate_email('alixaprodev@gmail')
print(isvalid)
#output: False

Although there might be many ways you can check if a given mail address exists or not. sometimes even if a mail address seems valid but it might not exist. so to make sure to send email to those address which exists we can first check if the email address exists. The same Python package that we use for the email validation provides us the ability to check if am email exists or not. Look at the following code. it will return True if the email address exists otherwise it will return Flase.  

from validate_email_address
import validate_email
isExists = validate_email('haxratali0@gmail.com', verify = True)
print(isExists)

Suggestion : 2

Basic Usage:

from validate_email
import validate_email
is_valid = validate_email(email_address = 'example@example.com', check_regex = True, check_mx = True, from_address = 'my@from.addr.ess', helo_host = 'my.host.name', smtp_timeout = 10, dns_timeout = 10, use_blacklist = True, debug = False)

Installation:

pip3 install py3 - validate - email

This method in dnslib is not suitable for bulk email validation. because smtp server blocks you if you send a lot of email validation request. then you should use proxy via pysocks library. You can also see this post on medium:

import socket
import socks # PySocks

from smtplib
import SMTP

class SocksSMTP(SMTP):

   def __init__(self,
      host = '',
      port = 0,
      local_hostname = None,
      timeout = socket._GLOBAL_DEFAULT_TIMEOUT,
      source_address = None,
      proxy_type = None,
      proxy_addr = None,
      proxy_port = None,
      proxy_rdns = True,
      proxy_username = None,
      proxy_password = None,
      socket_options = None):

   self.proxy_type = proxy_type
self.proxy_addr = proxy_addr
self.proxy_port = proxy_port
self.proxy_rdns = proxy_rdns
self.proxy_username = proxy_username
self.proxy_password = proxy_password
self.socket_options = socket_options
#
if proxy_type is provided then change the socket to socksocket
#
else behave like a normal SMTP class.
if self.proxy_type:
   self._get_socket = self.socks_get_socket

super(SocksSMTP, self).__init__(host, port, local_hostname, timeout, source_address)

def socks_get_socket(self, host, port, timeout):
   if self.debuglevel > 0:
   self._print_debug('connect: to', (host, port), self.source_address)
return socks.create_connection((host, port),
   timeout = timeout,
   source_address = self.source_address,
   proxy_type = self.proxy_type,
   proxy_addr = self.proxy_addr,
   proxy_port = self.proxy_port,
   proxy_rdns = self.proxy_rdns,
   proxy_username = self.proxy_username,
   proxy_password = self.proxy_password,
   socket_options = self.socket_options)

You could consider using a service like Real Email to do the validations. eg

import requests

api_key = "" // todo put your api key here
email_address = "foo@bar.com"
response = requests.get(
   "https://isitarealemail.com/api/email/validate",
   params = {
      'email': email_address
   },
   headers = {
      'Authorization': "Bearer " + api_key
   })

status = response.json()['status']
if status == "valid":
   print("email is valid")
elif status == "invalid":
   print("email is invalid")
else:
   print("email was unknown")

I found a way to check if the email exists. I use the Real Email API. I offer you a simple script on the basis of which you can continue to act

import requests

email_address = str(input('Email: '))
response = requests.get(
   "https://isitarealemail.com/api/email/validate",
   params = {
      'email': email_address
   })

status = response.json()['status']
if status == "valid":
   print("email is valid")
elif status == "invalid":
   print("email is invalid")
else:
   print("email was unknown")

Try this.

pip install validate_email

from validate_email
import validate_email
is_valid = validate_email('example@example.com', verify = True)

Suggestion : 3

Check if an email address is correct and really exists using the Python and Real Email,You can use a Regular Expression or the email_validator library to check if an Email Address is formatted correctly. For example using in Python.,To check if an address really exists you can use the Real Email API which does in depth Email Address inspection on the email server. In this example we use the Python Requests library.,An Email Address can look right but still be wrong and bounce. Real Email uses in depth email address validation to check if emails really exist without sending any messages.

You can use a Regular Expression or the email_validator library to check if an Email Address is formatted correctly. For example using in Python.

import reemail_regex = re.compile(r "[^@]+@[^@]+\.[^@]+") # "not an email"
is invalid so its false. >>> email_regex.match("not an email") != NoneFalse # "foo@a"
looks like an email, so it passes even though its not real. >>> email_regex.match("foo@a") != NoneFalse # "foo@gmail.com"
passes, gmail is a valid email server, # but gmail require more than 3 letters
for the address. >>> email_regex.match("foo@gmail.com") != NoneTrue

You could use it in your code like..

import reemail_regex = re.compile(r "[^@]+@[^@]+\.[^@]+") if email_regex.match("foo@bar.com"): print("address is valid")
else: print("not valid")

To check if an address really exists you can use the Real Email API which does in depth Email Address inspection on the email server. In this example we use the Python Requests library.

import requestsemail_address = "foo@bar.com"
response = requests.get("https://isitarealemail.com/api/email/validate", params = {
   'email': email_address
}) status = response.json()['status']
if status == "valid": print("email is valid") elif status == "invalid": print("email is invalid")
else: print("email was unknown")

Depending on your use case you may like to use bulk csv file validation and read the CSV file with Python. This is better if you have one big list of emails to check rather than an on going process. First upload your CSV file to Real Email, when it is validated you can read the result file with python like below.

import csvwith open('emails-validated.csv') as csvfile: reader = csv.DictReader(csvfile) for row in reader: print(row) # {
   'email': 'foo@bar.com',
   'status': 'valid'
}

Suggestion : 4

Last Updated : 08 Aug, 2021,GATE CS 2021 Syllabus

Examples: 

Input: ankitrai326 @gmail.com
Output: Valid Email

Input: my.ownsite @ourearth.org
Output: Valid Email

Input: ankitrai326.com
Output: Invalid Email

Valid Email
Valid Email
Invalid Email

Valid Email
Valid Email
Invalid Email

Suggestion : 5

py3-validate-email is a package for Python that check if an email is valid, not blacklisted, properly formatted and really exists.,First, a DNS query is issued for the email address' domain to retrieve a list of all MX records. That list is then stripped of duplicates and malformatted entries. If at the end of this procedure, at least one valid MX record remains, the check is considered successful.,All these exceptions descend from EmailValidationError. Please see below for the exact exceptions raised by the various checks. Note that all exception classes are defined in the module validate_email.exceptions.,validate_email_or_fail() raises DomainBlacklistedError if the email address belongs to a blacklisted domain.

You can install the package with pip:

python - m pip install py3 - validate - email

Basic usage:

from validate_email
import validate_email
is_valid = validate_email(
   email_address = 'example@example.com',
   check_format = True,
   check_blacklist = True,
   check_dns = True,
   dns_timeout = 10,
   check_smtp = True,
   smtp_timeout = 10,
   smtp_helo_host = 'my.host.name',
   smtp_from_address = 'my@from.addr.ess',
   smtp_skip_tls = False,
   smtp_tls_context = None,
   smtp_debug = False,
   address_types = frozenset([IPv4Address, IPv6Address]))

The update can be triggered manually:

from validate_email.updater
import update_builtin_blacklist

update_builtin_blacklist(
   force: bool = False,
   background: bool = True,
   callback: Callable = None
) - > Optional[Thread]

Suggestion : 6

validate_email is a package for Python that check if an email is valid, properly formatted, and really exists.,verify-email and validate_email are Python third-party libraries for checking email patterns as well as their existence.,By default, the validate_email library only checks the string matches with the email patterns or not.,Note: Python regex module re, we use above only check the format of email patterns, and it does not tell about the email really exists or not.

Python provides a built-in module called re, that provides regular expression matching operations. We can simply call in our program as:

import re

Code:

#
import regex module
import re

# finalize email regex pattern
pattern = "^[A-Za-z0-9]+[\._]?[A-Za-z0-9]+[@]\w+[.]\w{2,3}$"

def verify_email(email: str):
   ""
"function to verify email patterns"
""
verify = re.search(pattern, email)

# check
if verify object returns
# Match object or None
if verify:
   print("Email verified")
else:
   print("Email not verified")

email1 = "pythonsansar@example.com"
verify_email(email1)

email2 = "psansar77.com"
verify_email(email2)

email3 = "python.sansar@com"
verify_email(email3)

email4 = "python.sansar@example.com"
verify_email(email4)

email5 = "PYTHON.SANSAR@EXAMPLE.COM"
verify_email(email4)

Output:

Email verified
Email not verified
Email not verified
Email verified
Email verified

validate_email is a package for Python that check if an email is valid, properly formatted, and really exists.

pip install validate_email

Suggestion : 7

This simple API checks for SMTP servers on the domain provided. It then verifies if an email address exists in this domain.,This library focuses strictly on the domain part of an email address, and checks if it’s in an x@y.com format. ,This comprehensive library checks an email address for a proper structure, but it doesn’t just stop there.,This REST API verifies the format of each email. Like the libraries we just talked about, it also verifies if MX records exist and if an address is disposable. It offers a score for each email address checked.

This regex checks if an email address has a proper format. It also verifies if the top-level domain length is between two and four characters. You might want to raise the final number to a higher value to include top-level domains such as .travel, but that might also lead to some false positives.

^ [w - .] + @([w - ] + .) + [w - ] {
   2,
   4
}
$
  • Both consist of case-insensitive alphanumeric characters. Dashes, periods, hyphens or underscores are also allowed
  • Both can only start and end with alphanumeric characters
  • Both contain no white spaces
  • account has at least one character and domain has at least two
  • domain includes at least one period
  • And of course, there’s an ‘@’ symbol between them
^ [a - z]([w - ] * [a - z] | [w - .] * [a - z] {
   2,
} | [a - z]) * @[a - z]([w - ] * [a - z] | [w - .] * [a - z] {
   2,
} | [a - z]) {
   4,
}?.[a - z] {
   2,
}
$

Since the other two examples did almost nothing about typos, you can also include another condition for popular email providers, such as Gmail:

import re
example = "example@gmial.com"
if re.search("@gm(ia|a|i)l.com$", example):
   print("Maybe you meant @gmail.com?")


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