emailcheck.py

import DNS, smtplib, socket

def checkmail(mail):
	DNS.DiscoverNameServers()
	print "checking %s..."%(mail)
	hostname = mail[mail.find('@')+1:]
	mx_hosts = DNS.mxlookup(hostname)
	failed_mx = True
	for mx in mx_hosts:
		smtp = smtplib.SMTP()
		try:
			smtp.connect(mx[1])
			print "Stage 1 (MX lookup & connect) successful."
			failed_mx = False
			s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
			s.connect((mx[1], 25))
			s.recv(1024)
			s.send("HELO %s\n"%(mx[1]))
			s.recv(1024)
			s.send("MAIL FROM:< test@test.com>\n")
			s.recv(1024)
			s.send("RCPT TO:<%s>\n"%(mail))
			result = s.recv(1024)
			print result
			if result.find('Recipient address rejected') > 0:
				print "Failed at stage 2 (recipient does not exist)"
			else:
				print "Adress valid."
				failed_mx = False
			s.send("QUIT\n")
			break
		except smtplib.SMTPConnectError:
			continue
	if failed_mx:
		print "Failed at stage 1 (MX lookup & connect)."
	print ""
	if not failed_mx:
		return True
	return False