mail.local man page on OpenBSD

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MAIL.LOCAL(8)		OpenBSD System Manager's Manual		 MAIL.LOCAL(8)

NAME
     mail.local - store mail in a mailbox

SYNOPSIS
     mail.local [-Ll] [-f from] user ...

DESCRIPTION
     mail.local reads the standard input up to an end-of-file and appends it
     to each user's mail file.	The user must be a valid user name.

     The options are as follows:

     -f from
	     Specify the sender's name.

     -L	     Don't create a username.lock file while locking the spool.

     -l	     For compatibility, request that files named username.lock be used
	     for locking.  (This is the default behavior.)

     Individual mail messages in the mailbox are delimited by an empty line
     followed by a line beginning with the string ``From ''.  A line
     containing the string ``From '', the sender's name and a timestamp is
     prepended to each delivered mail message.	A blank line is appended to
     each message.  A greater-than character (`>') is prepended to any line in
     the message which could be mistaken for a ``From '' delimiter line.

     Significant efforts have been made to ensure that mail.local acts as
     securely as possible if the spool directory is mode 1777 or 755.  The
     default of mode 755 is more secure, but it prevents mail clients from
     using username.lock style locking.	 The use of 1777 is more flexible in
     an NFS shared-spool environment, so many sites use it.  However, it does
     carry some risks, such as attackers filling the spool disk.  Some of
     these problems may be alleviated by making the spool a separate
     filesystem, and placing quotas on it.  The use of any mode other than
     1777 and 755 for the spool directory is recommended against but may work
     properly.

     The mailbox is always locked using flock(2) while mail is appended.
     Unless the -L flag is specified, a username.lock file is also used.

     If the biff(1) service is returned by getservbyname(3), the biff server
     is notified of delivered mail.

ENVIRONMENT
     TZ	     Used to set the appropriate time zone on the timestamp.

FILES
     /tmp/local.XXXXXXXXXX  temporary files
     /var/mail/user	    user's mailbox directory

EXIT STATUS
     The mail.local utility exits 0 on success, and >0 if an error occurs.

SEE ALSO
     biff(1), mail(1), flock(2), getservbyname(3), comsat(8), sendmail(8)

HISTORY
     A superset of mail.local (handling mailbox reading as well as mail
     delivery) appeared in Version 7 AT&T UNIX as the program mail(1).

BUGS
     Since sendmail(8) bases its idea of whether a message has been delivered
     or not on the return value from mail.local, using quotas in /var/mail can
     be problematic.  By default, sendmail(8) will ask mail.local to deliver a
     message to multiple recipients if possible.  This causes problems in a
     quota environment since a message may be delivered to some users but not
     others due to disk quotas.	 Even though the message was delivered to some
     of the recipients, mail.local will exit with an exit code > 0, causing
     sendmail(8) to attempt redelivery later.  That means that some users will
     keep getting the same message every time sendmail(8) runs its queue.

     If you are running with disk quotas on /var/mail it is imperative that
     you unset the ``m'' mailer flag for the `local' mailer.  To do this,
     locate the line beginning with ``Mlocal'' in /etc/mail/sendmail.cf and
     remove the ``m'' from the flags section, denoted by ``F=''.  Alternately,
     you can override the default mailer flags by adding the line:

	   define(`LOCAL_MAILER_FLAGS', `rn9S')dnl

     to your ``.mc'' file (this is the source file that is used to generate
     /etc/mail/sendmail.cf).

OpenBSD 4.9		       September 3, 2010		   OpenBSD 4.9
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