NAME
postlock - lock mail folder and execute command SYNOPSIS
postlock [-c configdir] [-l lockstyle]
[-v] file command... DESCRIPTION The postlock(1) command locks file for exclusive access, and executes
command. The locking method is compatible with the Postfix UNIX-style local delivery agent. Options:
-c configdir Read the main.cf configuration file in the named directory instead of the default configuration directory.
-l lockstyle Override the locking method specified via the mailboxdeliv‐ erylock configuration parameter (see below).
-v Enable verbose logging for debugging purposes. Multiple -v options make the software increasingly verbose. Arguments: file A mailbox file. The user should have read/write permission. command... The command to execute while file is locked for exclusive access. The command is executed directly, i.e. without inter‐ pretation by a shell command interpreter. DIAGNOSTICS The result status is 75 (EXTEMPFAIL) when postlock(1) could not per‐ form the requested operation. Otherwise, the exit status is the exit status from the command. BUGS With remote file systems, the ability to acquire a lock does not neces‐ sarily eliminate access conflicts. Avoid file access by processes run‐ ning on different machines. ENVIRONMENT MAILCONFIG Directory with Postfix configuration files. MAILVERBOSE Enable verbose logging for debugging purposes. CONFIGURATION PARAMETERS The following main.cf parameters are especially relevant to this pro‐ gram. The text below provides only a parameter summary. See post‐ conf(5) for more details including examples. LOCKING CONTROLS deliverlockattempts (20) The maximal number of attempts to acquire an exclusive lock on a mailbox file or bounce(8) logfile. deliverlockdelay (1s) The time between attempts to acquire an exclusive lock on a mailbox file or bounce(8) logfile. stalelocktime (500s) The time after which a stale exclusive mailbox lockfile is removed.
mailboxdeliverylock (see 'postconf -d' output)
How to lock a UNIX-style local(8) mailbox before attempting delivery. RESOURCE AND RATE CONTROLS forkattempts (5) The maximal number of attempts to fork() a child process. forkdelay (1s) The delay between attempts to fork() a child process. MISCELLANEOUS CONTROLS
configdirectory (see 'postconf -d' output) The default location of the Postfix main.cf and master.cf con‐ figuration files. SEE ALSO postconf(5), configuration parameters LICENSE The Secure Mailer license must be distributed with this software. AUTHOR(S) Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA POSTLOCK(1)