Mail Services
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Messaging
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E-mail Concepts and Troubleshooting
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Messaging Servers (OpenFire and/or Jabberd)
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MTA (Postfix and/or Sendmail and/or Exim)
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Messaging clients (Pidgin, Kopete)
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IMAP/POP services (courier and/or dovecot and/or uw-imap)
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Messaging protocols (XMPP)
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Virus scanning (Amavis)
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Integration with LDAP and/or MySQL
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Spam filtering (SpamAssassin)
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IRC clients and servers
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MUA (Mai User Agents aka e-mail clients
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Secure POP, IMAP, SMTP (setting up certificates, configuration)
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Integration with LDAP and/or MySQL
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Greylisting
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Blacklisting and RBLs
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Gold Membership 
