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TelNet

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Install telnet

brew install telnet

Check email availability

  1. Run nslookup -q=mx example.com

    • To check the responsible mail server.
  2. Then run, telnet aspmx.l.google.com 25

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

      Trying 192.168.25.0 (would be a Google IP)...
      Connected to aspmx.l.google.com.
      Escape character is '^]'.
      220 mx.google.com ESMTP l10si1917496wrc.306 - gsmtp
      helo hi
      250 mx.google.com at your service
      mail from: <example@example.com>
      250 2.1.0 OK l10si1917496wrc.306 - gsmtp
      rcpt to: <example@example.com>
      250 2.1.5 OK l10si1917496wrc.306 - gsmtp
      quit