Qmail Quickstarter: VirtualizationJul 18, 2008, 03:30 (0 Talkback[s])
(Other stories by Kyle Wheeler)
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"Being able to define mailboxes independent of the underlying operating-system users can be very useful for many purposes. One reason this file is often used is for speed; it is compiled into a CDB-formatted database file, which is faster to read than text, and thus can make the process of looking up users fast. This is particularly valuable in cases when looking up users the usual way (i.e. via getpwent()) is slow—such as when there are very large numbers of users. Being able to create mailboxes independent of the underling operating system can also be used for many creative purposes and organizational schemes. The most popular use of this file, though, is to assist in organizing virtual domains. Each domain can be given its own directory, which may or may not have a unique system user assigned to it."
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