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REFORMAIL(1) S. Varshavchik. REFORMAIL(1) NAME reformail - E-mail reformatting tool SYNOPSIS reformail -s command [option...] reformail -D len filename reformail -x header:... reformail -X header:... reformail [options...] See below for additional 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 pro- gram on standard input. If the FILENO environment variable is set to a number, reformail will con- secutively increment FILENO each time the program is executed for each in- dividual 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 in- coming 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 re- cent mail. reformail reads the message on standard input. If the message has a Message-ID: header that's already in the cache file, reformail termi- nates with the exit code set to 0. Otherwise, reformail terminates with the exit code set to 1. Note Unlike a similar feature in the formail command, reformail takes care of locking the file, so it's not necessary to implement your own lock- ing mechanism for this option. 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 (hopefully) unique message ID for you. -A'header: value' Append a custom header to the message even if this header already ex- ists. If the header is either Message-ID: or Resent-Message-ID: and the value is empty, reformail generates a (hopefully) 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 speci- fied line termination. -f0 Any initial blank lines are removed. If the first non-blank line is a "From_" line, it gets converted to a "Return-Path:" header, and any ex- isting "Return-Path:" header gets removed. If the message does not start with a "From_" line, the message remains unchanged. -f1 Add the "From_" line to the message, if it's not there. reformail 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 ap- pended. -R oldheader: newheader: Rename the indicated header. -u'header:' If this header occurs multiple times in the message, remove all occur- rences except the first one. -U'header:' If this header occurs multiple times in the message, remove all occur- rences except the last one. AUTOREPLIES The autoreply options from earlier versions of mailbot have been moved into mailbot(1)[1]. 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-modifying options, such as -u/-U and -a/-A. Doing so yields unpredictable results. It's better to run reformail several times (use a pipe, perhaps). SEE ALSO courier(8)[2], sendmail(8), mailbot(1)[1], maildrop(1)[3]. AUTHOR Sam Varshavchik Author NOTES 1. mailbot(1) http://www.courier-mta.org/maildrop/mailbot.html 2. courier(8) http://www.courier-mta.org/maildrop/courier.html 3. maildrop(1) http://www.courier-mta.org/maildrop/maildrop.html Courier Mail Server 01/10/2026 REFORMAIL(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | AUTOREPLIES | BUGS | SEE ALSO | AUTHOR | NOTES
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