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The qmail package includes a local delivery agent, qmail-local, which
provides user-controlled mailing lists, cross-host alias loop detection,
and many other important qmail features.
There's one important difference between qmail-local and binmail:
qmail-local delivers mail by default into ~user/Mailbox, rather than
/var/spool/mail/user. It uses mbox format, with lockf locking on systems
that don't have flock (HP/UX, Solaris), and flock locking otherwise.
This file explains how to switch your system to ~user/Mailbox. You
aren't required to do this; for further discussion of /var/spool/mail,
and an explanation of how to continue using binmail for local
deliveries, see INSTALL.vsm.
The basic procedure for switching to ~user/Mailbox is simple:
* Move each /var/spool/mail/user to ~user/Mailbox. For safety, do
this in single-user mode.
* As root, set up a symbolic link from /var/spool/mail/user to
~user/Mailbox for each user. /var/spool/mail should be mode 1777,
so users will not be able to accidentally remove these links.
A few mail programs are unable to handle symbolic links, so you will
have to configure them to look at ~user/Mailbox directly:
* procmail: Change SYSTEM_MBOX in config.h and recompile; or, with
recent versions, define MAILSPOOLHOME in src/authenticate.c.
An alternative to symbolic links is hlfsd. Consult the documentation for
hlfsd if it is included in your operating system.
If /var/spool/mail is large, you can gain extra speed by configuring
all your mail software to look at ~user/Mailbox directly:
* Most MUAs: Put ``setenv MAIL $HOME/Mailbox'' in your system-wide
.cshrc and ``MAIL=$HOME/Mailbox; export MAIL'' in your system-wide
.profile.
* elm: Change "mailbox" to "Mailbox" around line 388 of newmbox.c and
recompile. (elm looks at $MAIL, but without this change elm will
fail if two users try to read mail simultaneously.)
* pine: Put ``inbox-path=Mailbox'' in your system-wide pine.conf.
(For pine versions more recent than 3.91, see also FAQ 6.2.)
* qpopper 2.2: Change /.mail to /Mailbox in pop_dropcopy.c and
recompile with -DHOMEDIRMAIL in CFLAGS.
Some vendors, in a misguided attempt to solve the security problems of
/var/spool/mail, have made all their mail software setgid mail. After
you move the mailboxes, you can---and, for security, should---remove
those setgid-mail bits.
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