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Email Validation Script avinashkranjan#297

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	`1`	`+<h1 align="center">Email Validator</h1>`
	`2`	`+A simple program which checks for Email Address Validity in three simple checks`
	`3`	`+`
	`4`	`+---------------------------------------------------------------------`
	`5`	`+## How it works`
	`6`	`+`
	`7`	`+- Syntax check, Checks for basic email address syntax using Regex`
	`8`	`+`
	`9`	`+- DNS check, Checks for domain validity and retrieving record names`
	`10`	`+`
	`11`	`+- 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.`
	`12`	`+`
	`13`	`+#### By [Md Salik](https://github.com/saaalik)`

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	`1`	`+from dns import resolver`
	`2`	`+import smtplib`
	`3`	`+import socket`
	`4`	`+import re`
	`5`	`+`
	`6`	`+#FIRST CHECK`
	`7`	`+def check_syntax(email):`
	`8`	`+ regex = r'^[a-z0-9]+[\._]?[a-z0-9]+[@]\w+[.]\w{2,3}$'`
	`9`	`+ if(re.search(regex,email)):`
	`10`	`+ pass`
	`11`	`+ else:`
	`12`	`+ print("Invalid Email! Bad Syntax")`
	`13`	`+ exit()`
	`14`	`+`
	`15`	`+#SECOND CHECK`
	`16`	`+def check_dns(email):`
	`17`	`+ domain = email.split("@")[-1]`
	`18`	`+ try:`
	`19`	`+ records = resolver.resolve(domain, 'MX')`
	`20`	`+ mxRecord = str(records[0].exchange)`
	`21`	`+ return mxRecord`
	`22`	`+ except:`
	`23`	`+ print("Invalid Email! The domain",domain,"does not exist")`
	`24`	`+ exit()`
	`25`	`+`
	`26`	`+#THIRD CHECK`
	`27`	`+def check_response(email, mxRecord):`
	`28`	`+ # Get local server hostname`
	`29`	`+ host = socket.gethostname()`
	`30`	`+`
	`31`	`+ # SMTP lib setup (use debug level for full output)`
	`32`	`+ server = smtplib.SMTP()`
	`33`	`+ server.set_debuglevel(0)`
	`34`	`+`
	`35`	`+ # SMTP Conversation`
	`36`	`+ server.connect(mxRecord)`
	`37`	`+ server.helo(host)`
	`38`	`+ server.mail(email)`
	`39`	`+ code, message = server.rcpt(str(email))`
	`40`	`+ server.quit()`
	`41`	`+`
	`42`	`+ # Assume 250 as Success`
	`43`	`+ if code == 250:`
	`44`	`+ print("The email address",email,"is VALID")`
	`45`	`+ else:`
	`46`	`+ print("Invalid Email!")`
	`47`	`+`
	`48`	`+email = input()`
	`49`	`+check_syntax(email)#CHECK1`
	`50`	`+mxRecord = check_dns(email)#CHECK2`
	`51`	`+check_response(email,mxRecord)#CHECK3`

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