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Linux Security
Use an encrypted protocol whenever possible
Even if you can trust your own network, can you trust the Internet and the other end?
Insecured protocols: Telnet, IMAP, POP3, SMTP, HTTP, etc
Secured replacements: SSH/Telnet-SSL, IMAPS, POP3S, SMTP over TLS, HTTPS
Protocols are widely accepted and easy to implement, on both client and server