REFORMAIL(1)REFORMAIL(1)NAMEreformail - E-mail reformatting tool
SYNOPSISreformail-D len filename
reformail-x header: ...
reformail-X header: ...
reformail [ options ... ]
DESCRIPTION
The reformail program reads a message on standard input, reformats it
in some way, and writes the message to standard output:
SPLITTING MAILBOXES INTO INDIVIDUAL MESSAGES
The -s option splits the mbox-formatted mailbox file on standard input
into individual messages. An external program is executed for each
message. The contents of each individual message will be provided to
the external program on standard input.
If the FILENO environment variable is set to a number, reformail will
consecutively increment FILENO each time the program is executed for
each individual message.
If FILENO is not set, it's initial value will be "000". If FILENO is
set to a non-numeric value, FILENO will remain unchanged.
DETECTING DUPLICATE MESSAGES
The -D option implements a simple way to delete duplicate messages in
incoming mail. filename is a file that will be approximately 'len'
bytes long. This file will be used by reformail to save message IDs
seen in recent mail. reformail reads the message on standard input.
If the message has a Message-ID: header that's already in the cache
file, reformail terminates with the exit code set to 0. Otherwise,
reformail terminates with the exit code set to 1.
EXTRACTING HEADERS
The -x and -X options extract the indicated headers from the message,
and print them to standard output. Multiple -x and -X options can be
specified at the same time, and may be intermixed.
The -x option extracts and prints the contents of the header. The -X
option prints the name of the header as well.
In all other situations, reformail copies the message on its standard
input to its standard output, reformatting the message as follows:
OPTIONS
-a'header: value'
Append a custom header to the message if this header does not
already exist. If the header is either Message-ID: or Resent-
Message-ID: and the value is empty, reformail generates a (hope‐
fully) unique message ID for you.
-A'header: value'
Append a custom header to the message even if this header
already exists. If the header is either Message-ID: or Resent-
Message-ID: and the value is empty, reformail generates a (hope‐
fully) unique message ID for you.
-c Concatenate multi-line headers. Headers split on multiple lines
are combined into a single line.
-dn If n is 1, each line will be terminated with CRLF. If n is 0
(default), each line will be terminated with LF. reformail
reads a message with either line terminator, and will force the
message to have the specified line termination.
-f0 Remove the "From_" line from the message, if it's there.
-f1 Add the "From_" line to the message, if it's not there. refor‐
mail will attempt to generate the "From_" line from any Errors-
To:, Return-Path:, or From: headers in the message. "root" will
be used if reformail is unable to determine the return address.
-i'header: value'
Appends a custom header to the message. If this header already
exists it is renamed by prepending "Old-" to the name of the
header.
-I'header: value'
Append a custom header to the message. If this header already
exists in the message, the old header is completely removed. If
the value is empty, any existing header is completely removed,
and nothing gets appended.
-k After generating an auto-reply header using the -r option, keep
the contents of the message itself in the auto-reply.
-p'prefix'
When both -r and -k options are used, the -p option can be used
to change the quoting prefix for each line from its default
value of "> ".
-P'salutation'
When both -r and -k options are used, the -p option is used to
specify the salutation that begins the contents of the message.
See AUTOREPLIES below.
-r Generates headers for an auto-reply to this message. This option
can be used to create replies to both E-mail and Usenet messages
(reformail created both the In-Reply-To: and References: head‐
ers). When generating replies to Usenet messages, you'll proba‐
bly have to always use the -t option also.
-t Use user-generated headers in order to determine the return
address for the -r option. Otherwise, reformail uses machine
generated headers.
-R oldheader: newheader:
Rename the indicated header.
-u'header:'
If this header occurs multiple times in the message, remove all
occurrences except the first one.
-U'header:'
If this header occurs multiple times in the message, remove all
occurrences except the last one.
AUTOREPLIES
The -r option generates a set of headers for an automatic reply to the
message, instead of producing just a reformatted copy of the message.
As an enhancement, the -r option is smart enough to be able to properly
generate an auto-reply to either an E-mail message, or a Usenet message
( reformail creates both a In-Reply-To: and References: header).
The To: header is set to the apparent sender of the message. To deter‐
mine the sender of the message, reformail prefers to look at machine-
generated headers, such a Errors-To:and Return-Path:, instead of user-
generated headers, such as From: or Reply-To:.
The -t option makes reformail use user-generated headers instead of
machine-generated headers.
The -ra option copies To: headers from the original message into the
auto-reply. The -rA option copies To: and Cc: headers.
Normally, the contents of the original message are removed. The -k
option copies the contents of the original message, which each line
prefixed by "> ". Use the -p option to specify a different prefix.
The contents of the message are preceded by a salutation specified by
the -P option. If not specified, the salutation defaults to "%F
writes:%n". Within the salutation, each occurrence of % followed by
another character is replaced by some information from the original
message, as follows:
%C Replaced by the contents of the X-Newsgroup: header in the orig‐
inal message.
%d Replaced by the contents of the Date: header in the original
message.
%f Replaced by the E-mail address of the sender of the original
message.
%F Replaced by the name of the sender of the original message. If
no name was given, the E-mail address is used.
%i Replaced by the contents of the Message-ID: header in the origi‐
nal message.
%n %n will cause reformail to insert a line break here.
%N Replaced by the contents of the Newsgroups: header in the origi‐
nal message.
%s Replaced by the contents of any Subject: header in the original
message.
BUGS
For the -a, -A, and -I options, a space after the header name and the
colon is considered to be a non-empty field.
Do not provide the same header to more than one family of header-modi‐
fying options, such as -u/-U and -a/-A. Doing so yields unpredictable
results. It's better to run reformail several times (use a pipe, per‐
haps).
SEE ALSOcourier(8), sendmail(8), mailbot(1), maildrop(1).
Double Precision, Inc. 19 February 2004 REFORMAIL(1)
