At work, we're looking at hosting a Large Number of email accounts.  I've
successfully convinced at least my immediate boss that it would make sense to
go with something sendmail/procmail-based, running under something unixy.
Now I'm being asked a lot of questions about details which are a little out
of my depth...

The primary part that I'm not familiar with is running mail accounts without
corresponding system (login) accounts.  I assume that this is standard for
large mail hosts, but wouldn't mind being told that I'm wrong.  If this is
what we're likely to want to do, where can I find information on how to do
it?

(OTOH, we need per-user procmail configurations, which implies that the users
would need something like a home directory.  Which could easily mean that the
better course would be to set them up as real system accounts and give them
/bin/false as their shell.)

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