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The job that pop-before-smtp performs is also performed by other software, such as DRAC. This daemon differs from DRAC in its design target. DRAC is a client-server design, and requires patching each pop or imap daemon that is going to participate. Pop-before-smtp requires no mods to the other daemons, and uses no client-server communication. So it's much, much simpler to install and maintain, and it fails to address the needs of people with separate pop/imap and smtp servers. Another system with some similarities to DRAC is WHOSON.