Ticket Postmaster Module

Postmaster modules are used during the postmaster process. There are two kinds of postmaster modules:

• PostMasterPre: used after parsing an email.
• PostMasterPost: used after an email is processed and is in the database.

If you want to create your own postmaster filter, just create your own module. These modules are located under Kernel/System/PostMaster/Filter/*.pm. For default modules see the admin manual. You just need two functions: new() and Run().

The following is an exemplary module to match emails and set X-OTOBO-Headers (see doc/X-OTOBO-Headers.txt for more info).

Kernel/Config/Files/XML/MyModule.xml:

<ConfigItem Name="PostMaster::PreFilterModule###1-Example" Required="0" Valid="1">
    <Description Translatable="1">Example module to filter and manipulate incoming messages.</Description>
    <Group>Ticket</Group>
    <SubGroup>Core::PostMaster</SubGroup>
    <Setting>
        <Hash>
            <Item Key="Module">Kernel::System::PostMaster::Filter::Example</Item>
            <Item Key="Match">
                <Hash>
                    <Item Key="From">noreply@</Item>
                </Hash>
            </Item>
            <Item Key="Set">
                <Hash>
                    <Item Key="X-OTOBO-Ignore">yes</Item>
                </Hash>
            </Item>
        </Hash>
    </Setting>
</ConfigItem>

And the actual filter code in Kernel/System/PostMaster/Filter/Example.pm:

# --
# Copyright (C) 2019-2021 Rother OSS GmbH, https://otobo.de/
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (GPL). If you
# did not receive this file, see https://www.gnu.org/licenses/gpl-3.0.txt.
# --

package Kernel::System::PostMaster::Filter::Example;

use strict;
use warnings;

our @ObjectDependencies = (
    'Kernel::System::Log',
);

sub new {
    my ( $Type, %Param ) = @_;

    # allocate new hash for object
    my $Self = {};
    bless ($Self, $Type);

    $Self->{Debug} = $Param{Debug} || 0;

    return $Self;
}

sub Run {
    my ( $Self, %Param ) = @_;
    # get config options
    my %Config = ();
    my %Match = ();
    my %Set = ();
    if ($Param{JobConfig} && ref($Param{JobConfig}) eq 'HASH') {
        %Config = %{$Param{JobConfig}};
        if ($Config{Match}) {
            %Match = %{$Config{Match}};
        }
        if ($Config{Set}) {
            %Set = %{$Config{Set}};
        }
        }
        # match 'Match => ???' stuff
        my $Matched = '';
        my $MatchedNot = 0;
        for (sort keys %Match) {
        if ($Param{GetParam}->{$_} && $Param{GetParam}->{$_} =~ /$Match{$_}/i) {
            $Matched = $1 || '1';
            if ($Self->{Debug} > 1) {
                $Kernel::OM->Get('Kernel::System::Log')->Log(
                    Priority => 'debug',
                    Message => "'$Param{GetParam}->{$_}' =~ /$Match{$_}/i matched!",
                );
            }
        }
        else {
            $MatchedNot = 1;
            if ($Self->{Debug} > 1) {
                $Kernel::OM->Get('Kernel::System::Log')->Log(
                    Priority => 'debug',
                    Message => "'$Param{GetParam}->{$_}' =~ /$Match{$_}/i matched NOT!",
                );
            }
        }
        }
        # should I ignore the incoming mail?
        if ($Matched && !$MatchedNot) {
        for (keys %Set) {
            if ($Set{$_} =~ /\[\*\*\*\]/i) {
                $Set{$_} = $Matched;
            }
            $Param{GetParam}->{$_} = $Set{$_};
            $Kernel::OM->Get('Kernel::System::Log')->Log(
                Priority => 'notice',
                Message => "Set param '$_' to '$Set{$_}' (Message-ID: $Param{GetParam}->{'Message-ID'}) ",
            );
        }
    }

    return 1;
}

1;

The following image shows you the email processing flow.

Email Processing Flow