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Goals
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FTP
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only needed to transfer software updates
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optional
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TELNET
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only needed for administrative access
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optional
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SMTP
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needed for sending emails
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mandatory
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DNS
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needed for SMTP name resolution
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mandatory
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HTTP
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only needed for documentation
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optional
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POP3
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needed for picking up email (either pop3 or imap)
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mandatory
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IMAP4
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needed for picking up email (either imap or pop3)
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mandatory
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LDAP
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needed for email resolution
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optional
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