PROCMAIL(1)PROCMAIL(1)NAMEprocmail ‐ autonomous mail processor
SYNOPSISprocmail [‐ptoY] [‐f fromwhom]
[parameter=value | rcfile] ...
procmail [‐toY] [‐f fromwhom] [‐a argument]
‐d recipient ...
procmail [‐ptY] ‐m [parameter=value] ... rcfile
[argument] ...
procmail ‐v
DESCRIPTION
For a quick start, see NOTES at the end.
Procmail should be invoked automatically over the .forward
file mechanism as soon as mail arrives. Alternatively,
when installed by a system administrator, it can be
invoked from within the mailer immediately. When invoked,
it first sets some environment variables to default val‐
ues, reads the mail message from stdin until an EOF, sepa‐
rates the body from the header, and then, if no command
line arguments are present, it starts to look for a file
named $HOME/.procmailrc. According to the processing
recipes in this file, the mail message that just arrived
gets distributed into the right folder (and more). If no
rcfile is found, or processing of the rcfile falls off the
end, procmail will store the mail in the default system
mailbox.
If no rcfiles and no ‐p have been specified on the command
line, procmail will, prior to reading $HOME/.procmailrc,
interpret commands from /etc/procmailrc (if present).
Care must be taken when creating /etc/procmailrc, because,
if circumstances permit, it will be executed with root
privileges (contrary to the $HOME/.procmailrc file of
course).
If running suid root or with root privileges, procmail
will be able to perform as a functionally enhanced, back‐
wards compatible mail delivery agent.
Procmail can also be used as a general purpose mail fil‐
ter, i.e. provisions have been made to enable procmail to
be invoked in a special sendmail rule.
The rcfile format is described in detail in the proc‐
mailrc(5) man page.
The weighted scoring technique is described in detail in
the procmailsc(5) man page.
Examples for rcfile recipes can be looked up in the proc‐
mailex(5) man page.
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Signals
TERMINATE Terminate prematurely and requeue the mail.
HANGUP Terminate prematurely and bounce the mail.
INTERRUPT Terminate prematurely and bounce the mail.
QUIT Terminate prematurely and silently lose the
mail.
ALARM Force a timeout (see TIMEOUT).
USR1 Equivalent to a VERBOSE=off.
USR2 Equivalent to a VERBOSE=on.
OPTIONS
‐v Procmail will print its version number, display its
compile time configuration and exit.
‐p Preserve any old environment. Normally procmail
clears the environment upon startup, except for the
value of TZ. However, in any case: any default val‐
ues will override any preexisting environment vari‐
ables, i.e. procmail will not pay any attention to
any predefined environment variables, it will happily
overwrite them with its own defaults. For the list
of environment variables that procmail will preset
see the procmailrc(5) man page. If both ‐p and ‐m
are specified, the list of preset environment vari‐
ables shrinks to just: LOGNAME, HOME, SHELL, ORGMAIL
and MAILDIR.
‐t Make procmail fail softly, i.e. if procmail cannot
deliver the mail to any of the destinations you gave,
the mail will not bounce, but will return to the
mailqueue. Another delivery‐attempt will be made at
some time in the future.
‐f fromwhom
Causes procmail to regenerate the leading ‘From ’
line with fromwhom as the sender (instead of ‐f one
could use the alternate and obsolete ‐r). If
fromwhom consists merely of a single ‘‐’, then proc‐
mail will only update the timestamp on the ‘From ’
line (if present, if not, it will generate a new
one).
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PROCMAIL(1)PROCMAIL(1)
‐o Instead of allowing anyone to generate ‘From ’ lines,
simply override the fakes.
‐Y Assume traditional Berkeley mailbox format, ignore
any Content‐Length: fields.
‐a argument
This will set $1 to be equal to argument. It can be
used to pass meta information along to procmail.
This is typically done by passing along the $@x
information from the sendmail mailer rule.
‐d recipient ...
This turns on explicit delivery mode, delivery will
be to the local user recipient. This, of course,
only is possible if procmail has root privileges (or
if procmail is already running with the recipient’s
euid and egid). Procmail will setuid to the intended
recipients and delivers the mail as if it were
invoked by the recipient with no arguments (i.e. if
no rcfile is found, delivery is like ordinary mail).
This option is incompatible with ‐p.
‐m Turns procmail into a general purpose mail filter.
In this mode one rcfile must be specified on the com‐
mand line. After the rcfile, procmail will accept an
unlimited number of arguments. If the rcfile is an
absolute path starting with /etc/procmailrcs/ without
backward references (i.e. the parent directory cannot
be mentioned) procmail will, only if no security vio‐
lations are found, take on the identity of the owner
of the rcfile (or symbolic link). For some advanced
usage of this option you should look in the EXAMPLES
section below.
ARGUMENTS
Any arguments containing an ’=’ are considered to be envi‐
ronment variable assignments, they will all be evaluated
after the default values have been assigned and before the
first rcfile is opened.
Any other arguments are presumed to be rcfile paths
(either absolute, or if they start with ‘./’ relative to
the current directory; any other relative path is relative
to $HOME, unless the ‐m option has been given, in which
case all relative paths are relative to the current direc‐
tory); procmail will start with the first one it finds on
the command line. The following ones will only be parsed
if the preceding ones have a not matching HOST‐directive
entry, or in case they should not exist.
If no rcfiles are specified, it looks for $HOME/.proc‐
mailrc. If not even that can be found, processing will
continue according to the default settings of the
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PROCMAIL(1)PROCMAIL(1)
environment variables and the ones specified on the com‐
mand line.
EXAMPLES
Examples for rcfile recipes can be looked up in the proc‐
mailex(5) man page. A small sample rcfile can be found in
the NOTES section below.
Skip the rest of this EXAMPLES section unless you are a
system administrator who is vaguely familiar with send‐
mail.cf syntax.
The ‐m option is typically used when procmail is called
from within a rule in the sendmail.cf file. In order to
be able to do this it is convenient to create an extra
‘procmail’ mailer in your sendmail.cf file (in addition to
the perhaps already present ‘local’ mailer that starts up
procmail). To create such a ‘procmail’ mailer I’d suggest
something like:
Mprocmail, P=/usr/bin/procmail, F=mSDFMhun, S=11,
R=21,
A=procmail ‐m $h $g $u
This enables you to use rules like the following (most
likely in ruleset 0) to filter mail through the procmail
mailer (please note the leading tab to continue the rule,
and the tab to separate the comments):
R$*<@some.where>$*
$#procmail $@/etc/procmailrcs/some.rc
$:$1@some.where.procmail$2
R$*<@$*.procmail>$*
$1<@$2>$3 Already filtered, map back
And /etc/procmailrcs/some.rc could be as simple as:
:0 # sink all junk
mail
* ^Subject:.*junk
/dev/null
:0 # pass along all
other mail
! ‐oi ‐f "$@"
Do watch out when sending mail from within the /etc/proc‐
mailrcs/some.rc file, if you send mail to addresses which
match the first rule again, you could be creating an end‐
less mail loop.
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PROCMAIL(1)PROCMAIL(1)FILES
/etc/passwd to set the recipient’s LOGNAME,
HOME and SHELL variable defaults
/var/spool/mail/$LOGNAME
system mailbox; both the system
mailbox and the immediate directory
it is in will be created everytime
procmail starts and either one is
not present
/etc/procmailrc initial global rcfile
/etc/procmailrcs/ special privileges path for rcfiles
$HOME/.procmailrc default rcfile
/var/spool/mail/$LOGNAME.lock
lockfile for the system mailbox
(not automatically used by proc‐
mail, unless $DEFAULT equals
/var/spool/mail/$LOGNAME and proc‐
mail is delivering to $DEFAULT)
/usr/sbin/sendmail default mail forwarder
_????‘hostname‘ temporary ‘unique’ zero‐length
files created by procmailSEE ALSOprocmailrc(5), procmailsc(5), procmailex(5), sh(1),
csh(1), mail(1), mailx(1), binmail(1), uucp(1),
aliases(5), sendmail(8), egrep(1), grep(1), biff(1),
comsat(8), lockfile(1), formail(1), cron(1)DIAGNOSTICS
Autoforwarding mailbox found
The system mailbox had its suid or
sgid bit set, procmail terminates
with EX_NOUSER assuming that this
mailbox must not be delivered to.
Bad substitution of "x"
Not a valid environment variable
name specified.
Closing brace unexpected
There was no corresponding opening
brace (nesting block).
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Conflicting options Not all option combinations are
useful
Conflicting x suppressed
Flag x is not compatible with some
other flag on this recipe.
Couldn’t create "x" The system mailbox was missing and
could not/will not be created.
Couldn’t create maildir part "x"
The maildir folder "x" is missing
one or more required subdirectories
and procmail could not create them.
Couldn’t create or rename temp file "x"
An error occured in the mechanics
of delivering to the directory
folder "x".
Couldn’t determine implicit lockfile from "x"
There were no ‘>>’ redirectors to
be found, using simply ‘$LOCKEXT’
as locallockfile.
Couldn’t read "x" Procmail was unable to open an rc‐
file or it was not a regular file,
or procmail couldn’t open an MH di‐
rectory to find the highest num‐
bered file.
Couldn’t unlock "x" Lockfile was already gone, or write
permission to the directory where
the lockfile is has been denied.
Deadlock attempted on "x"
The locallockfile specified on this
recipe is equal to a still active
$LOCKFILE.
Denying special privileges for "x"
Procmail will not take on the iden‐
tity that comes with the rcfile be‐
cause a security violation was
found (e.g. ‐p or variable assign‐
ments on the command line) or proc‐
mail had insufficient privileges to
do so.
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Descriptor "x" was not open
As procmail was started, stdin,
stdout or stderr was not connected
(possibly an attempt to subvert se‐
curity)
Enforcing stricter permissions on "x"
The system mailbox of the recipient
was found to be unsecured, procmail
secured it.
Error while writing to "x"
Nonexistent subdirectory, no write
permission, pipe died or disk full.
Exceeded LINEBUF Buffer overflow detected, LINEBUF
was too small, PROCMAIL_OVERFLOW
has been set.
Excessive output quenched from "x"
The program or filter "x" tried to
produce too much output for the
current LINEBUF, the rest was dis‐
carded.
Extraneous x ignored The action line or other flags on
this recipe makes flag x meaning‐
less.
Failed forking "x" Process table is full (and NORES‐
RETRY has been exhausted).
Failed to execute "x" Program not in path, or not exe‐
cutable.
Forced unlock denied on "x"
No write permission in the directo‐
ry where lockfile "x" resides, or
more than one procmail trying to
force a lock at exactly the same
time.
Forcing lock on "x" Lockfile "x" is going to be removed
by force because of a timeout (see
also: LOCKTIMEOUT).
Incomplete recipe The start of a recipe was found,
but it stranded in an EOF.
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Insufficient privileges
Procmail either needs root privi‐
leges, or must have the right
(e)uid and (e)gid to run in deliv‐
ery mode. The mail will bounce.
Invalid regexp "x" The regular expression "x" contains
errors (most likely some missing or
extraneous parens).
Kernel‐lock failed While trying to use the kernel‐sup‐
ported locking calls, one of them
failed (usually indicates an OS er‐
ror), procmail ignores this error
and proceeds.
Kernel‐unlock failed See above.
Lock failure on "x" Can only occur if you specify some
real weird (and illegal) lockfile‐
names or if the lockfile could not
be created because of insufficient
permissions or nonexistent subdi‐
rectories.
Lost "x" Procmail tried to clone itself but
could not find back rcfile "x" (it
either got removed or it was a rel‐
ative path and you changed directo‐
ry since procmail opened it last
time).
Missing action The current recipe was found to be
incomplete.
Missing closing brace A nesting block was started, but
never finished.
Missing name The ‐f option needs an extra argu‐
ment.
Missing argument You specified the ‐a option but
forgot the argument.
Missing rcfile You specified the ‐m option, proc‐
mail expects the name of an rcfile
as argument.
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Missing recipient You specified the ‐d option or
called procmail under a different
name, it expects one or more recip‐
ients as arguments.
No space left to finish writing "x"
The filesystem containing "x" does
not have enough free space to per‐
mit delivery of the message to the
file.
Out of memory The system is out of swap space
(and NORESRETRY has been exhaust‐
ed).
Processing continued The unrecognised options on the
command line are ignored, proceed‐
ing as usual.
Program failure (nnn) of "x"
Program that was started by proc‐
mail returned nnn instead of EX‐
IT_SUCCESS (=0); if nnn is nega‐
tive, then this is the signal the
program died on.
Quota exceeded while writing "x"
The filesize quota for the recipi‐
ent on the filesystem containing
"x" does not permit delivering the
message to the file.
Renaming bogus "x" into "x"
The system mailbox of the recipient
was found to be bogus, procmail
performed evasive actions.
Rescue of unfiltered data succeeded/failed
A filter returned unsuccessfully,
procmail tried to get back the
original text.
Skipped: "x" Couldn’t do anything with "x" in
the rcfile (syntax error), ignoring
it.
Suspicious rcfile "x" The owner of the rcfile was not the
recipient or root, the file was
world writable, or the directory
that contained it was world
writable, or this was the default
rcfile ($HOME/.procmailrc) and ei‐
ther it was group writable or the
directory that contained it was
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PROCMAIL(1)PROCMAIL(1)
group writable (the rcfile was not
used).
Terminating prematurely whilst waiting for ...
Procmail received a signal while it
was waiting for ...
Timeout, terminating "x"
Timeout has occurred on program or
filter "x".
Timeout, was waiting for "x"
Timeout has occurred on program,
filter or file "x". If it was a
program or filter, then it didn’t
seem to be running anymore.
Truncated file to former size
The file could not be delivered to
successfully, so the file was trun‐
cated to its former size.
Truncating "x" and retrying lock
"x" does not seem to be a valid
filename or the file is not empty.
Unable to treat as directory "x"
Either the suffix on "x" would in‐
dicate that it should be an MH or
maildir folder, or it was listed as
an second folder into which to
link, but it already exists and is
not a directory.
Unexpected EOL Missing closing quote, or trying to
escape EOF.
Unknown user "x" The specified recipient does not
have a corresponding uid.
EXTENDED DIAGNOSTICS
Extended diagnostics can be turned on and off through set‐
ting the VERBOSE variable.
[pid] time & date Procmail’s pid and a timestamp.
Generated whenever procmail logs a
diagnostic and at least a second
has elapsed since the last times‐
tamp.
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Acquiring kernel‐lock Procmail now tries to kernel‐lock
the most recently opened file (de‐
scriptor).
Assigning "x" Environment variable assignment.
Assuming identity of the recipient, VERBOSE=off
Dropping all privileges (if any),
implicitly turns off extended diag‐
nostics.
Bypassed locking "x" The mail spool directory was not
accessible to procmail, it relied
solely on kernel locks.
Executing "x" Starting program "x". If it is
started by procmail directly (with‐
out an intermediate shell), proc‐
mail will show where it separated
the arguments by inserting commas.
HOST mismatched "x" This host was called "x", HOST con‐
tained something else.
Locking "x" Creating lockfile "x".
Linking to "x" Creating a hardlink between direc‐
tory folders.
Match on "x" Condition matched.
Matched "x" Assigned "x" to MATCH.
No match on "x" Condition didn’t match, recipe
skipped.
Non‐zero exitcode (nnn) by "x"
Program that was started by proc‐
mail as a condition or as the ac‐
tion of a recipe with the ‘W’ flag
returned nnn instead of EXIT_SUC‐
CESS (=0); the usage indicates that
this is not an unexpected condi‐
tion.
Notified comsat: "$LOGNAME@offset:file"
Sent comsat/biff a notice that mail
arrived for user $LOGNAME at ‘off‐
set’ in ‘file’.
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PROCMAIL(1)PROCMAIL(1)
Opening "x" Opening file "x" for appending.
Rcfile: "x" Rcfile changed to "x".
Reiterating kernel‐lock
While attempting several locking
methods, one of these failed.
Procmail will reiterate until they
all succeed in rapid succession.
Score: added newtotal "x"
This condition scored ‘added’
points, which resulted in a ‘newto‐
tal’ score.
Unlocking "x" Removing lockfile "x" again.
WARNINGS
You should create a shell script that uses lockfile(1) be‐
fore invoking your mail shell on any mailbox file other
than the system mailbox (unless of course, your mail shell
uses the same lockfiles (local or global) you specified in
your rcfile).
In the unlikely event that you absolutely need to kill
procmail before it has finished, first try and use the
regular kill command (i.e. not kill ‐9, see the subsec‐
tion Signals for suggestions), otherwise some lockfiles
might not get removed.
Beware when using the ‐t option, if procmail repeatedly is
unable to deliver the mail (e.g. due to an incorrect rc‐
file), the system mailqueue could fill up. This could ag‐
gravate both the local postmaster and other users.
The /etc/procmailrc file might be executed with root priv‐
ileges, so be very careful of what you put in it. SHELL
will be equal to that of the current recipient, so if
procmail has to invoke the shell, you’d better set it to
some safe value first. See also: DROPPRIVS.
Keep in mind that if chown(1) is permitted on files in
/etc/procmailrcs/, that they can be chowned to root (or
anyone else) by their current owners. For maximum securi‐
ty, make sure this directory is executable to root only.
Procmail is not the proper tool for sharing one mailbox
among many users, such as when you have one POP account
for all mail to your domain. It can be done if you manage
to configure your MTA to add some headers with the enve‐
lope recipient data in order to tell Procmail who a mes‐
sage is for, but this is usually not the right thing to
do. Perhaps you want to investigate if your MTA offers
‘virtual user tables’, or see e.g. the ‘multidrop’ facili‐
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PROCMAIL(1)PROCMAIL(1)
ty of Fetchmail.
BUGS
After removing a lockfile by force, procmail waits $SUS‐
PEND seconds before creating a new lockfile so that anoth‐
er process that decides to remove the stale lockfile will
not remove the newly created lock by mistake.
Procmail uses the regular TERMINATE signal to terminate
any runaway filter, but it does not check if the filter
responds to that signal and it only sends it to the filter
itself, not to any of the filter’s children.
A continued Content‐Length: field is not handled correct‐
ly.
The embedded newlines in a continued header should be
skipped when matching instead of being treated as a single
space as they are now.
MISCELLANEOUS
If there is an existing Content‐Length: field in the head‐
er of the mail and the ‐Y option is not specified, proc‐
mail will trim the field to report the correct size.
Procmail does not change the fieldwidth.
If there is no Content‐Length: field or the ‐Y option has
been specified and procmail appends to regular mailfold‐
ers, any lines in the body of the message that look like
postmarks are prepended with ‘>’ (disarms bogus mailhead‐
ers). The regular expression that is used to search for
these postmarks is:
‘0rom ’
If the destination name used in explicit delivery mode is
not in /etc/passwd, procmail will proceed as if explicit
delivery mode was not in effect. If not in explicit de‐
livery mode and should the uid procmail is running under,
have no corresponding /etc/passwd entry, then HOME will
default to /, LOGNAME will default to #uid and SHELL will
default to /bin/sh.
When in explicit delivery mode, procmail will generate a
leading ‘From ’ line if none is present. If one is al‐
ready present procmail will leave it intact. If procmail
is not invoked with one of the following user or group
ids
: root, daemon, uucp, mail, x400, network, list, slist,
lists or news, but still has to generate or accept a new
‘From ’ line, it will generate an additional ‘>From ’ line
to help distinguish fake mails.
For security reasons procmail will only use an absolute or
$HOME‐relative rcfile if it is owned by the recipient or
root, not world writable, and the directory it is con‐
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PROCMAIL(1)PROCMAIL(1)
tained in is not world writable. The $HOME/.procmailrc
file has the additional constraint of not being group‐
writable or in a group‐writable directory.
If /var/spool/mail/$LOGNAME is a bogus mailbox (i.e. does
not belong to the recipient, is unwritable, is a symbolic
link or is a hard link), procmail will upon startup try to
rename it into a file starting with ‘BOGUS.$LOGNAME.’ and
ending in an inode‐sequence‐code. If this turns out to be
impossible, ORGMAIL will have no initial value, and hence
will inhibit delivery without a proper rcfile.
If /var/spool/mail/$LOGNAME already is a valid mailbox,
but has got too loose permissions on it, procmail will
correct this. To prevent procmail from doing this make
sure the u+x bit is set.
When delivering to directories, MH folders, or maildir
folders, you don’t need to use lockfiles to prevent sever‐
al concurrently running procmail programs from messing up.
Delivering to MH folders is slightly more time consuming
than delivering to normal directories or mailboxes, be‐
cause procmail has to search for the next available number
(instead of having the filename immediately available).
On general failure procmail will return EX_CANTCREAT, un‐
less option ‐t is specified, in which case it will return
EX_TEMPFAIL.
To make ‘egrepping’ of headers more consistent, procmail
concatenates all continued header fields; but only inter‐
nally. When delivering the mail, line breaks will appear
as before.
If procmail is called under a name not starting with
‘procmail’ (e.g. if it is linked to another name and in‐
voked as such), it comes up in explicit delivery mode, and
expects the recipients’ names as command line arguments
(as if ‐d had been specified).
Comsat/biff notifications are done using udp. They are
sent off once when procmail generates the regular logfile
entry. The notification messages have the following ex‐
tended format (or as close as you can get when final de‐
livery was not to a file):
$LOGNAME@offset_of_message_in_mailbox:abso‐
lute_path_to_mailbox
Whenever procmail itself opens a file to deliver to, it
consistently uses the following kernel locking strategies:
fcntl(2).
Procmail is NFS‐resistant and eight‐bit clean.
BuGless 2000/08/25 14
PROCMAIL(1)PROCMAIL(1)NOTES
Calling up procmail with the ‐h or ‐? options will cause
it to display a command‐line help and recipe flag quick‐
reference page.
There exists an excellent newbie FAQ about mailfilters
(and procmail in particular), it is being maintained by
Nancy McGough <nancym@ii.com> and can be obtained by send‐
ing a mail to mail‐server@rtfm.mit.edu with the following
in the body:
send usenet/news.answers/mail/filtering‐faq
Instead of using the system provided invocation of proc‐
mail when mail arrives, you can control the invocation of
procmail yourself. In this case your $HOME/.forward (be‐
ware, it has to be world readable) file should contain the
line below. Be sure to include the single and double
quotes, and unless you know your site to be running smrsh
(the SendMail Restricted SHell), it must be an absolute
path.
"|exec /usr/bin/procmail"
Some mailers (notably exim) do not currently accept the
above syntax. In such case use this instead:
|/usr/bin/procmail
Procmail can also be invoked to postprocess an already
filled system mailbox. This can be useful if you don’t
want to or can’t use a $HOME/.forward file (in which case
the following script could periodically be called from
within cron(1), or whenever you start reading mail):
#!/bin/sh
ORGMAIL=/var/spool/mail/$LOGNAME
if cd $HOME &&
test ‐s $ORGMAIL &&
lockfile ‐r0 ‐l1024 .newmail.lock 2>/dev/null
then
trap "rm ‐f .newmail.lock" 1 2 3 13 15
umask 077
lockfile ‐l1024 ‐ml
cat $ORGMAIL >>.newmail &&
cat /dev/null >$ORGMAIL
lockfile ‐mu
formail ‐s procmail <.newmail &&
rm ‐f .newmail
rm ‐f .newmail.lock
fi
exit 0
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PROCMAIL(1)PROCMAIL(1)
A sample small $HOME/.procmailrc:
PATH=/usr/local/bin:/usr/bin:/bin
MAILDIR=$HOME/Mail #you’d better make sure it exists
DEFAULT=$MAILDIR/mbox #completely optional
LOGFILE=$MAILDIR/from #recommended
:0:
* ^From.*berg
from_me
:0
* ^Subject:.*Flame
/dev/null
Other examples for rcfile recipes can be looked up in the
procmailex(5) man page.
SOURCE
This program is part of the procmail mail‐processing‐pack‐
age (v3.15) available at http://www.procmail.org/ or
ftp.procmail.org in pub/procmail/.
MAILINGLIST
There exists a mailinglist for questions relating to any
program in the procmail package:
<procmail‐users@procmail.org>
for submitting questions/answers.
<procmail‐users‐request@procmail.org>
for subscription requests.
If you would like to stay informed about new versions and
official patches send a subscription request to
procmail‐announce‐request@procmail.org
(this is a readonly list).
AUTHORS
Stephen R. van den Berg
<srb@cuci.nl>
Philip A. Guenther
<guenther@gac.edu>
BuGless 2000/08/25 16
