NAME
    RT::Extension::EmailReplyDelimiter - Strip text from emails after a
    delimiter

DESCRIPTION
    This extension alters email while it is being received by Request
    Tracker <https://bestpractical.com/request-tracker>, removing text and
    any associated image attachments appearing after a reply delimiter such
    as "*##- Please type your reply above this line -##*".

RT VERSION
    Known to work with RT 4.2.16, 4.4.4, 5.0.1, and 6.0.2.

INSTALLATION
    As root, build the Makefile and use it to install the extension. This
    example works with Debian's request-tracker5 package:

     export RTHOME=/usr/share/request-tracker5/lib
     perl Makefile.PL
     make
     make install

    Edit your RT_SiteConfig.pm file or equivalent, such as
    /etc/request-tracker5/RT_SiteConfig.pm, and add these lines:

     Set(@EmailReplyDelimiters,
         '##- Please type your reply above this line -##',
         qr/<div[^>]+id="appendonsend"/
     );
     Plugin('RT::Extension::EmailReplyDelimiter');

    Then, restart the service.

CONFIGURATION
    In RT_SiteConfig.pm, adjust *@EmailReplyDelimiters* so it contains a
    list of all of the email reply delimiters you will be using.

    Delimiters can be either literal strings (quoted with single or double
    quotes), or compiled regular expressions (quoted using qr//).

    Restart the service after making changes to this configuration item.

    Then adjust the relevant RT templates to include a reply delimiter, on a
    line by itself, in the appropriate place.

  Examples
    Note that for the extension to be enabled, this line is always required:

     Plugin('RT::Extension::EmailReplyDelimiter');

    The following examples only suggest different reply delimiters; the
    Plugin() line should always also be present.

    Simplest possible configuration:

     Set(@EmailReplyDelimiters,
         '##- Please type your reply above this line -##'
     );

    For this to work, you'll need to add "*##- Please type your reply above
    this line -##*" to all of your RT templates in the appropriate place.
    Then, when someone replies to an RT message by email, the quoted message
    they are replying to will not be included when their reply reaches RT.

    Configuration which finds and removes the quoted message when the sender
    is using a recent Outlook version, or Outlook webmail, and also includes
    the template-dependent configuration above:

     Set(@EmailReplyDelimiters,
         '##- Please type your reply above this line -##',
         qr/<div[^>]+id="appendonsend"/
     );

    A configuration which removes the quoted part from most messages sent
    from Outlook, with two fallback template-dependent delimiters which work
    as above:

     Set(@EmailReplyDelimiters,
         # New Outlook and webmail put this right before the quoted text starts:
         qr/<div[^>]+id="appendonsend"/,
 
         # Mobile Outlook puts this around the quoted message:
         qr/<div[^>]+id="divRplyFwdMsg"/,
 
         # Classic Outlook inserts a div like this before quoted text:
         '<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">',
 
         # Outlook puts this in the plain text version - a line made of
         # underscores then From on the line below that, with a Windows style
         # newline:
         "________________________________\r\nFrom: ",
 
         # Put these in the RT templates themselves, so we can detect and remove
         # the quoted part of replies even if none of the above matches:
         '##- Please type your reply above this line.',
         '##- Do not edit quoted section when replying.',
     );

    The benefit of the more complex configuration is that it can strip all
    of the quoted text, not leaving any header parts. The downside is that
    if someone *forwards* an email from Outlook to RT, the forwarded content
    is likely to be lost.

ISSUES AND CONTRIBUTIONS
    The project is held on Codeberg <https://codeberg.org>; its issue
    tracker is at
    <https://codeberg.org/ivarch/rt-extension-emailreplydelimiter/issues>.

    The following people have contributed to this project, and their
    assistance is acknowledged and greatly appreciated:

    *   grantemsley <https://codeberg.org/grantemsley> - fixed issues with
        quoted-printable messages, added support for regular expression
        delimiters, and provided examples for removing quoted text from
        messages sent from Outlook (#1
        <https://codeberg.org/ivarch/rt-extension-emailreplydelimiter/pulls/
        1>).

LICENSE AND COPYRIGHT
    Copyright 2023, 2026 Andrew Wood.

    License GPLv3+: GNU GPL version 3 or later:
    <https://gnu.org/licenses/gpl.html>

    This is free software: you are free to change and redistribute it. There
    is NO WARRANTY, to the extent permitted by law.