mailcow-dockerized/data/web/inc/lib/sieve/extensions/mime.xml

<?xml version='1.0' standalone='yes'?>

<extension name="mime">
    <command name="foreverypart">
        <parameter type="string" name="name" occurrence="optional" />
        <block />
    </command>

    <command name="break">
        <parameter type="string" name="name" occurrence="optional" />
    </command>

    <tagged-argument extends="(header|address|exists)">
        <parameter type="tag" name="mime" regex="mime" occurrence="optional" />
    </tagged-argument>
    <tagged-argument extends="(header|address|exists)">
        <parameter type="tag" name="anychild" regex="anychild" occurrence="optional" />
    </tagged-argument>
    <tagged-argument extends="(header)">
        <parameter type="tag" name="type" occurrence="optional" />
    </tagged-argument>
    <tagged-argument extends="(header)">
        <parameter type="tag" name="subtype" occurrence="optional" />
    </tagged-argument>
    <tagged-argument extends="(header)">
        <parameter type="tag" name="contenttype" occurrence="optional" />
    </tagged-argument>
    <tagged-argument extends="(header)">
        <parameter type="tag" name="param" regex="param" occurrence="optional">
            <parameter type="stringlist" name="param-list" />
        </parameter>
    </tagged-argument>
    <tagged-argument extends="(header|address|exists)">
        <parameter type="stringlist" name="header-names" />
    </tagged-argument>
    <tagged-argument extends="(header)">
        <parameter type="stringlist" name="key-list" />
    </tagged-argument>

    <action name="replace">
        <parameter type="tag" name="mime" regex="mime" occurrence="optional" />
        <parameter type="string" name="subject" occurrence="optional" />
        <parameter type="string" name="from" occurrence="optional" />
        <parameter type="string" name="replacement" />
    </action>

    <action name="enclose">
        <parameter type="string" name="subject" occurrence="optional" />
        <parameter type="stringlist" name="headers" occurrence="optional" />
        <parameter type="string" name="text" />
    </action>

    <action name="extracttext">
        <parameter type="tag" name="first" regex="first" occurrence="optional" />
        <parameter type="number" name="number" occurrence="optional" />
        <parameter type="string" name="varname" />
    </action>
</extension>