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Install telnet

brew install telnet

Check email availability

  1. Run nslookup -q=mx

    • To check the responsible mail server.
  2. Then run, telnet 25

    • Using Google as mail server
    • After running the command, we should see below outputs

      Trying (would be a Google IP)...
      Connected to
      Escape character is '^]'.
      220 ESMTP l10si1917496wrc.306 - gsmtp
      helo hi
      250 at your service
      mail from: <[email protected]>
      250 2.1.0 OK l10si1917496wrc.306 - gsmtp
      rcpt to: <>
      250 2.1.5 OK l10si1917496wrc.306 - gsmtp