Unix- TCP/IP Security (6)

• SMTP - Simple Mail Transfer Protocol

  • not simple at all! Routing of mail messages
  • /etc/sendmail.cf, /etc/aliases, $HOME/.forwarding
  • sendmail is dangerous; use POP3 and IMAP4
  • must be patched
  • .forwarding must be protected to avoid unauthorized forwarding
  • activity should be monitored in syslog
  • port 25

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