How to check if a Email address exist or not using the command line

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  • In this example we will test for the Email address [email protected], replace the gmail Email address with the email address you want to test
  • Open the command line/command promt and type in the following command
    nslookup -type=mx gmail.com

    This command will list the MX records of the gmail domain eg.

    Server:        10.0.2.2
     
    Address:    10.0.2.2#53
    
     
    Non-authoritative answer:
     
    gmail.com    mail exchanger = 5 gmail-smtp-in.l.google.com.
     
    gmail.com    mail exchanger = 10 alt1.gmail-smtp-in.l.google.com.
     
    gmail.com    mail exchanger = 20 alt2.gmail-smtp-in.l.google.com.
     
    gmail.com    mail exchanger = 30 alt3.gmail-smtp-in.l.google.com.
     
    gmail.com    mail exchanger = 40 alt4.gmail-smtp-in.l.google.com.
     
     
    Authoritative answers can be found from:
     
    alt1.gmail-smtp-in.l.google.com    internet address = 74.125.39.27
     
    alt3.gmail-smtp-in.l.google.com    internet address = 74.125.65.27
     
    alt4.gmail-smtp-in.l.google.com    internet address = 74.125.91.27
     
    alt2.gmail-smtp-in.l.google.com    internet address = 209.85.225.27
     
    gmail-smtp-in.l.google.com    internet address = 209.85.227.27
  • Select one of the servers listed in the list of MX records and pretend to send a message to that server from your local machine
    • Connect to the server via telnet
      telnet alt1.gmail-smtp-in.l.google.com 25
    • Type in the HELO command
      HELO
    • Identify yourself using any email address eg. [email protected]
      mail from:<[email protected]>
    • Type in the email address that you wish to verify
  • After the last command entered, the server will respond with a message whether the email address exist/is valid or not e.g.
    250 2.1.5 OK o15si4900954fal.31 //For success

    and

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

Image Credits: Photo by Isis França on Unsplash.

Last Updated On April 06, 2018

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