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Commit bd20758

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Merge pull request avinashkranjan#532 from saaalik/email-validator
Email Validation Script avinashkranjan#297 
2 parents 7a107fd + e9d5a08 commit bd20758

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‎Email-Validator/README.md

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<h1 align="center">Email Validator</h1>
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A simple program which checks for Email Address Validity in three simple checks
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---------------------------------------------------------------------
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## How it works
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- Syntax check, Checks for basic email address syntax using Regex
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- DNS check, Checks for domain validity and retrieving record names
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- SMTP check, HELO, MAIL FROM and RCPT TO commands are implemented. In the RCPT, If the server sends back a 250, then that means we are good to send an email (the email address exists), otherwise the server will return a different status code (usually a 550), meaning the email address does not exist on that server.
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---------------------------------------------------------------------
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## Requirements (Py modules used)
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- re (Regex)
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- dns
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- smtplib
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- socket
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---------------------------------------------------------------------
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## TESTCASES
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```
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#INPUT
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mdsaaalikgmalia.com
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#OUTPUT
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Check 1 FAILED! Bad Syntax, Invalid Email!
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```
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```
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#INPUT
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mdsaaalik@gmalia.com
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#OUTPUT
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Check 1 (Syntax) Passed
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Check 2 FAILED! The domain gmalia.com does not exist, Invalid Email!
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```
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```
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#INPUT
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salik_invalid@gmail.com
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#OUTPUT
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Check 1 (Syntax) Passed
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Check 2 (DNS - gmail-smtp-in.l.google.com.) Passed
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Check 3 FAILED! The user salik_invalid does not exist, Invalid Email!
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```
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```
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#INPUT
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mdsaaalik@gmail.com
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#OUTPUT
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Check 1 (Syntax) Passed
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Check 2 (DNS - alt4.gmail-smtp-in.l.google.com.) Passed
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Check 3 (SMTP response) Passed
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mdsaaalik@gmail.com is a VALID email address!
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```
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```
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#INPUT
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mdsaaalik@yahoo.com
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#OUTPUT
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Check 1 (Syntax) Passed
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Check 2 (DNS - mta5.am0.yahoodns.net.) Passed
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Check 3 HALTED! The domain yahoo.com , either does not have an SMTP or have restricted access through external scripts
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```
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#### By [Md Salik](https://github.com/saaalik)

‎Email-Validator/email_verification.py

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from dns import resolver
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import smtplib
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import socket
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import re
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#FIRST CHECK
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def check_syntax(email):
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regex = r'^[a-z0-9]+[\._]?[a-z0-9]+[@]\w+[.]\w{2,3}$'
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if(re.search(regex,email)):
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print("Check 1 (Syntax) Passed")
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else:
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print("Check 1 FAILED! Bad Syntax, Invalid Email!")
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exit()
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#SECOND CHECK
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def check_dns(email,domain):
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try:
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records = resolver.resolve(domain, 'MX')
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mxRecord = str(records[0].exchange)
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print("Check 2 (DNS -",mxRecord+") Passed")
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return mxRecord
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except:
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print("Check 2 FAILED! The domain",domain,"does not exist, Invalid Email!")
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exit()
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#THIRD CHECK
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def check_response(email, domain, mxRecord):
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try:
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# Get local server hostname
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host = socket.gethostname()
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# SMTP lib setup (use debug level for full output)
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server = smtplib.SMTP()
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server.set_debuglevel(0)
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# SMTP Conversation
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server.connect(mxRecord)
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server.helo(host)
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server.mail(email)
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code, message = server.rcpt(str(email))
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server.quit()
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# Assume 250 as Success
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if code == 250:
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print("Check 3 (SMTP response) Passed")
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print(email,"is a VALID email address!")
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else:
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print("Check 3 FAILED! The user",email.split("@")[0],"does not exist, Invalid Email!")
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except socket.error as socketerror:
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print("Check 3 HALTED! The domain",domain,", either does not have an SMTP or have restricted access through external scripts")
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email = input("Enter your Email id :")
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domain = email.split("@")[-1]
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check_syntax(email)#CHECK1
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mxRecord = check_dns(email,domain)#CHECK2
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check_response(email,domain,mxRecord)#CHECK3

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