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17 ports in your infrastructure.

• port
  22

  SSH (Secure Shell), remote login and command execution.
• port
  25

  SMTP, sending email between mail servers.
• port
  53

  DNS, domain name resolution.
• port
  80

  HTTP, unencrypted web traffic.
• port
  123

  NTP, network time synchronization.
• port
  143

  IMAP, reading email from a mail server.
• port
  443

  HTTPS, encrypted web traffic.
• port
  465

  SMTPS, email submission over TLS.
• port
  587

  SMTP submission, email submission from clients.
• port
  873

  rsync, file synchronization service.