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Limiting User mailbox size in /var/spool


 
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Old 10-23-2009
Limiting User mailbox size in /var/spool

How can one limit the size of user mailboxes in /var/spool/mail?
 

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EXIM_LOCK(8)						      System Manager's Manual						      EXIM_LOCK(8)

NAME
exim_lock - Mailbox maintenance SYNOPSIS
exim_lock [options]mailbox-file DESCRIPTION
The exim_lock utility locks a mailbox file using the same algorithm as Exim. For a discussion of locking issues, see section 25.2. exim_lock can be used to prevent any modification of a mailbox by Exim or a user agent while investigating a problem. The utility requires the name of the file as its first argument. If the locking is successful, the second argument is run as a command (using C's "system()" function); if there is no second argument, the value of the SHELL environment variable is used; if this is unset or empty, /bin/sh is run. When the command finishes, the mailbox is unlocked and the utility ends. The following options are available: -fcntl Use "fcntl()" locking on the open mailbox. -interval This must be followed by a number, which is a number of seconds; it sets the interval to sleep between retries (default 3). -lockfile Create a lock file before opening the mailbox. -mbx Lock the mailbox using MBX rules. -q Suppress verification output. -retries This must be followed by a number; it sets the number of times to try to get the lock (default 10). -timeout This must be followed by a number, which is a number of seconds; it sets a timeout to be used with a blocking "fcntl()" lock. If it is not set (the default), a non-blocking call is used. -v Generate verbose output. If none of -fcntl, -lockfile or -mbx are given, the default is to create a lock file and also use "fcntl()" locking on the mailbox, which is the same as Exim's default. The use of -fcntl requires that the file be writable; the use of -lockfile requires that the directory containing the file be writable. Locking by lock file does not last for ever; Exim assumes that a lock file is expired if it is more than 30 minutes old. The -mbx option is mutually exclusive with -fcntl. It causes a shared lock to be taken out on the open mailbox, and an exclusive lock on the file /tmp/.n.m where n and m are the device number and inode number of the mailbox file. When the locking is released, if an exclusive lock can be obtained for the mailbox, the file in /tmp is deleted. The default output contains verification of the locking that takes place. The -v option causes some additional information to be given. The -q option suppresses all output except error messages. A command such as exim_lock /var/spool/mail/spqr runs an interactive shell while the file is locked, whereas exim_lock -q /var/spool/mail/spqr <<End <some commands> End runs a specific non-interactive sequence of commands while the file is locked, suppressing all verification output. A single command can be run by a command such as exim_lock -q /var/spool/mail/spqr "cp /var/spool/mail/spqr /some/where" Note that if a command is supplied, it must be entirely contained within the second argument - hence the quotes. BUGS
This manual page needs a major re-work. If somebody knows better groff than us and has more experience in writing manual pages, any patches would be greatly appreciated. SEE ALSO
exim(8), /usr/share/doc/exim4-base/ AUTHOR
This manual page was stitched together from spec.txt by Andreas Metzler <ametzler at downhill.at.eu.org>, for the Debian GNU/Linux system (but may be used by others). March 26, 2003 EXIM_LOCK(8)

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