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MAILDROPEX(7)		    Double Precision, Inc.		 MAILDROPEX(7)

       maildropex - maildrop filtering language	examples

       $HOME/.mailfilter, $HOME/.mailfilters/*

       If $HOME/.mailfilter exists, filtering instructions in this file	will
       be carried out prior to delivering the message. The filtering
       instructions may	instruct maildrop to discard the message, save the
       message in a different mailbox, or forward the message to another
       address.	If $HOME/.mailfilter does not exist, or	does not provide
       explicit	delivery instructions, maildrop	delivers the message to	the
       user's system mailbox.

       The files in $HOME/.mailfilters are used	when maildrop is invoked in
       embedded	mode.

       Take all	mail that's sent to the	'auto' mailing list, and save it in
       Mail/auto. The 'auto' mailing list software adds	a "Delivered-To:"	header to all messages:

	   if (/^Delivered-To: *auto@domain\.com$/)
	       to Mail/auto

       After the to command delivers the message, maildrop automatically stops
       filtering and terminates	without	executing the subsequent instructions
       in the filter file.

       Take all	mail from <> about the current project status,
       save it in Mail/project,	then forward a copy to John:

	   if (/^From: *boss@domain\.com/ \
	       && /^Subject:.*[:wbreak:]project	status[:wbreak:]/)
	       cc "!john"
	       to Mail/project

       Note that it is necessary to use	a backslash in order to	continue the
       if statement on the next	line.

       Keep copies of the last 50 messages that	you received in	the maildir
       directory 'backup'. NOTE: 'backup' must be a maildir directory, not a
       mailbox.	You can	create a maildir using the maildirmake command.

	   cc backup
	   `cd backup/new && rm	-f dummy \`ls -t | sed -e 1,50d\``

       Put this	at the beginning of your filter	file, before any other
       filtering instructions. This is a good idea to have when	you are
       learning	maildrop. If you make a	mistake	and accidentally delete	a
       message,	you can	recover	it from	the backup/new subdirectory.

       Save messages that are at least 100 lines long (approximately) into

		if ( $LINES > 100 )
		   to Mail/IN.Large

       Send messages from the auto mailing list	to the program 'archive',
       using a lock file to make sure that only	one instance of	the archive
       program will be running at the same time:

		if (/^Delivered-To: *auto@domain\.com$/)
		   dotlock "auto.lock" {

			  to "|archive"

       Check if	the Message-ID:	header in the message is identical to the same
       header that was recently	seen. Discard the message if it	is, otherwise
       continue	to filter the message:

	   `reformail -D 8000 duplicate.cache`
	   if (	$RETURNCODE == 0 )

       The reformail[1]	command	maintains a list of recently seen Message-IDs
       in the file duplicate.cache.

	   Unlike a similar feature in the formail command, reformail[1] takes
	   care	of locking the file, so	it's not necessary to implement	your
	   own locking mechanism for this option.

       Here's a	more complicated example. This fragment	is intended to go
       right after the message has been	filtered according to your regular
       rules, and just before the message should be saved in your mailbox:

	   cc $DEFAULT
	   xfilter "reformail -r -t"
	   getaddr($MATCH) =~ /^.*/;

	   flock "vacation.lock" {
		   `fgrep -iqx "$MATCH"	vacation.lst 2>/dev/null || { \
			     echo "$MATCH" >>vacation.lst ; \
			     exit 1 ; \
			 } `
	   if (	$RETURNCODE == 0 )
	   to "| ( cat - ; echo	''; cat	vacation.msg) |	$SENDMAIL"

       This code maintains a list of everyone who sent you mail	in the file
       called vacation.lst. When a message is received from anyone that	is not
       already on the list, the	address	is added to the	list, and the contents
       of the file vacation.msg	are mailed back	to the sender. This is
       intended	to reply notify	people that you	will not be answering mail for
       a short period of time.

       The first statement saves the original message in your regular mailbox.
       Then, xfilter[2]	is used	to generate an autoreply header	to the sender.
       The To: header in the autoreply - which was the sender of the original
       message - is extracted, and the getaddr[3] function is used to strip
       the person's name, leaving the address only. The	file vacation.lst is
       checked,	using a	lock file to guarantee atomic access and update
       (overkill, probably). Note that the backslashes are required.

       If the address is already in the	file, maildrop exits, otherwise	the
       contents	of vacation.msg	are appended to	the autoreply header, and
       mailed out.

	   An easier to	make a vacation	script is with mailbot(1)[4].

       Here's a	version	of the vacation	script that uses a GDBM	database file
       instead.	The difference between this script and the previous script is
       that the	previous script	will send a vacation message to	a given	E-mail
       address only once. The following	script will store the time that	the
       vacation	message	was sent in the	GDBM file. If it's been	at least a
       week since the vacation message has been	sent to	the given address,
       another vacation	message	will be	sent.

       Even though a GDBM database file	is used, locking is still necessary
       because the GDBM	library	does not allow more than one process to	open
       the same	database file for writing:

	   cc $DEFAULT
	   xfilter "reformail -r -t"
	   getaddr($MATCH) =~ /^.*/;
	   flock "vacation.lock" {
	       if (gdbmopen("vacation.dat", "C") == 0)
		  if ( (prev_time=gdbmfetch($MATCH)) ne	"" && \
			$prev_time >= $current_time - 60 * 60 *	24 * 7)
		  gdbmstore($MATCH, $current_time)
	   to "| ( cat - ; echo	''; cat	vacation.msg) |	$SENDMAIL"

       This script requires that maildrop must be compiled with	GDBM support
       enabled,	which is done by default if GDBM libraries are present.

       After you return	from vacation, you can use a simple Perl script	to
       obtain a	list of	everyone who sent you mail (of course, that can	also
       be determined by	examining your mailbox).

       maildrop(1)[5], maildropfilter(7)[6], reformail(1)[1], mailbot(1)[4],
       egrep(1), grep(1), sendmail(8).

       Sam Varshavchik

	1. reformail

	2. xfilter

	3. getaddr

	4. mailbot(1)

	5. maildrop(1)

	6. maildropfilter(7)

Courier	Mail Server		  11/04/2020			 MAILDROPEX(7)


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