Telnet test

  • Useful for reproducing issues
  • Useful to confirm connection issues 
  • Protocol knowledge
    • telnet aspmx.l.google.com 25
    • telnet smtp.gmail.com 465
    • mail from: user@domain.com
    • rcpt to:user@domain(2).com
    • data
      • mail headers (from, to, subject, body)
    • end session (.)


http://support.microsoft.com/kb/196748