NAME
nullmailer-inject - Reformat and inject a message into the queue.
SYNOPSIS
nullmailer-inject [-a] [-b] [-e] [-f sender] [-h] [recipient [recipient
...]]
DESCRIPTION
This program reads a email message from standard input, reformats its
header to comply with RFC822, and sends the resulting message to the
queue.
HEADER FIELDS
The following lines are parsed for recipient addresses: To, Cc, Bcc,
Apparently-To, Resent-To, Resent-Cc, and Resent-Bcc.
The following sender address lines are parsed and rewritten: Sender,
From, Reply-To, Return-Path, Return-Receipt-To, Errors-To, Resent-
Sender, Resent-From, and Resent-Reply-To. If the Return-Path header
field is present and contains a single address, its contents will be
used to set the envelope sender address.
If the message contains any of the following fields, it is treated as a
resent message: Resent-Sender, Resent-From, Resent-Reply-To, Resent-To,
Resent-Cc, Resent-Bcc, Resent-Date, Resent-Message-ID. If the message
is resent, only the recipient fields prefixed with Resent- are examined
for addresses.
Any occurrences of Bcc, Resent-Bcc, Return-Path, or Content-Length are
discarded after they are parsed (if necessary).
If the header lacks a Message-Id field, a unique string is generated
and added to the message. If the header lacks a Date field, the
current local date and time in RFC822 format is appended to the
message. If the message has no To or Cc fields, the following line is
appended to the message:
Cc: recipient list not shown: ;
ADDRESS LISTS
Address lists are expected to follow the syntax set out in RFC822. The
following is a simplified explanation of the syntax.
An address list is list of addresses seperated by commas. An
individual address may have one of the following three forms:
user@fqdn, comment<user@fqdn>, or phrase:address-list;. Any of the
first two forms may be used within the address list of the third form.
Any word containing special characters must be placed in double quotes
and the special characters must be preceded with a backslash. Comments
may be placed between addresses in parenthesis. All comments are
ignored.
Addresses lists are reformatted as they are parsed for ease of later
re-parsing when the message reaches the destination(s). If an address
is missing a fqdn, nullmailer-inject adds one.
OPTIONS
-a Use only the command line arguments as recipient addresses.
Ignore the header recipient lines.
-b Use both the command line arguments and data from the message
header as recipient addresses.
-e Use either the command line arguments (if there are any) or data
from the message header (if there are no arguments) as the
recipient addresses.
-f sender
Set the envelope sender address to sender .
-h Use only data from the message header as the recipient
addresses.
-n Do not queue the message, but print the reformatted contents to
standard output.
-v Print out the envelope (sender and recipient addresses)
preceding the message when printing the message to standard
output.
RETURN VALUE
Exits 0 if it was successful, otherwise it prints a diagnostic message
to standard output and exits 1.
ENVIRONMENT
The environment variable NULLMAILER_FLAGS is parsed and the behavior of
nullmailer-inject is modified if any of the following letters are
present:
c Use "address (comment)" style in the generated From field
instead of the default "comment <address>" style.
f Ignore and remove any From header lines and always insert a
generated one.
i Ignore and remove any Message-Id header lines.
s Ignore and remove any Return-Path header lines.
t Insert a To line containing a list of the recipients if the
header does not contain either a To or a Cc field. If the
message is determined to be a resent message (see above), a
Resent-To field is added if the header does not contain either a
Resent-To or a Resent-Cc field.
The user name is set by NULLMAILER_USER, MAILUSER, USER, or LOGNAME,
whichever comes first. If none of the above are set the name is taken
from the password file, or set to unknown if that fails.
The host name is set by the canonicalized value of NULLMAILER_HOST,
MAILHOST, or HOSTNAME, whichever comes first, or the defaulthost config
file if none of the above are set (see below).
The full name of the user is set by NULLMAILER_NAME, MAILNAME, or NAME,
whichever comes first.
The user and host name of the envelope sender default to the user and
host name set above, but may be overridden by NULLMAILER_SUSER and
NULLMAILER_SHOST.
If NULLMAILER_QUEUE is set, the program named is used in place of
nullmailer-queue to queue the formatted message.
CONTROL FILES
When reading the following files, a single line is read and stripped of
all leading and trailing whitespace characters.
defaultdomain
The content of this file is appended to any host name that does
not contain a period (except localhost), including defaulthost
and idhost. Defaults to the value of the /etc/mailname system
file, if it exists, otherwise the literal name defauldomain.
defaulthost
The content of this file is appended to any address that is
missing a host name. Defaults to the value of the /etc/mailname
system file, if it exists, otherwise the literal name
defaulthost.
idhost The content of this file is used when building the message-id
string for the message. Defaults to the canonicalized value of
defaulthost.
/etc/mailname
The fully-qualifiled host name of the computer running
nullmailer. Defaults to the literal name me.
SEE ALSO
nullmailer-queue(8)
NOTES
This document glosses over very many details of how address parsing and
rewriting actually works (among other things).
nullmailer-inject(1)