How to Check if an Email Address is Valid or fake

If you want check the mail address is real or invalid? Then we can check the mail id by sending a mail to that email address  and if the sent message doesn’t bounce, the mail id is real.

 Now you can check any email address without sending a test mail and it doesn't reqire any large amount of technical skills or computer knowledge or any third party software. Just you can check the e-mail address by command prompt on their operating system or using SMTP protocol.

 When you send an email to someone, then email is received by an SMTP server. Automatically the OS searches the MX (Mail Exchange) records of the allocated domain (Yahoo, Gmail, Hotmail...etc.) name.

  If you want to send an email to hai@gmail.com, the SMTP server search the MX (Mail Exchange) records for the domain (gmail.com) name. If the MX records of domain is available, then it will go to verify that the email username (hai) is present or not.

Procedure to check the validity of an Email Address

First, we want to check the obama@gmail.com is exists or not?

Step 1: If you use windows then enable telnet in windows

                                        (or)

               If you use Mac, then open iterm app

Step 2: Run the command line: "Start" → "Run" → "cmd" → "OK".

Step 3: At the command prompt, type the below command:

               nslookup  –type=mx gmail.com

nslookup is a network utility program used to get information about Internet servers.

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Here we mentioned the type as MX, the command will search the MX records of the email domain (gmail.com).You can change the domain name (Yahoo, Gmail, Hotmail..etc) which you want to verify.

Step 4: From the above MX records for a domain. Take the "smtp-in.l.google.com" and type the following line in the command prompt to Connect to the mail server.

              telnet gmail-smtp-in.l.google.com 25

              Here "25" is the port number.

Step 5: Next Type "HELO" command used to identify the SMTP client for the SMTP server.

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Step 6: Type the sender e-mail address "MAIL FROM:<glazee4u@gmail.com>". It should be a valid email address to get the «250 ok» server response. If not, the program won't go to the next step.

Step 7: Type the recipient’s email address that you want to check:

               rcpt to:<obama@gmail.com>      

If the recipient’s email address is valid then you will get «250 ok» server response otherwise you will get error «550» messages like below.

The email account that you tried to reach does not exist.     

The email account that you tried to reach is disabled.

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