The qmail package includes a local delivery agent, qmail-local, whichprovides 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 systemsthat don't have flock (HP/UX, Solaris), and flock locking otherwise.This file explains how to switch your system to ~user/Mailbox. Youaren't required to do this; for further discussion of /var/spool/mail,and an explanation of how to continue using binmail for localdeliveries, 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 willhave 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 forhlfsd if it is included in your operating system.If /var/spool/mail is large, you can gain extra speed by configuringall 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. Afteryou move the mailboxes, you can---and, for security, should---removethose setgid-mail bits.