This online email verification tool actually connects to the mail server and checks whether the mailbox exists or not.
What is being verified:
Valid domain: "email@example.com" is not valid
Valid user: verify if the user and mailbox really exist
All you have to do visit this website
put email id you want to send email & check the validity of email address.
here are the results.
MX record about hotmail.com exists.
Connection succeeded to mx4.hotmail.com SMTP.
220 SNT0-MC2-F25.Snt0.hotmail.com Sending unsolicited commercial or bulk e-mail to Microsoft's computer network is prohibited. Other restrictions are found at http://privacy.microsoft.com/en-us/anti-spam.mspx. Sun, 13 Jan 2013 02:52:13 -0800
250 SNT0-MC2-F25.Snt0.hotmail.com (18.104.22.168) Hello [22.214.171.124]
> RCPT TO: <firstname.lastname@example.org>