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

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

<extension name="notify">

	<command name="notify">
		<parameter type="tag" name="method" regex="method" occurrence="optional">
			<parameter type="string" name="method-name" />
		</parameter>

		<parameter type="tag" name="id" regex="id" occurrence="optional">
			<parameter type="string" name="message-id" />
		</parameter>

		<parameter type="tag" name="priority" regex="(low|normal|high)" occurrence="optional" />

		<parameter type="tag" name="message" regex="message" occurrence="optional">
			<parameter type="string" name="message-text" />
		</parameter>
	</command>

	<command name="denotify">
		<parameter type="matchtype" occurrence="optional">
			<parameter type="string" name="message-id" />
		</parameter>

		<parameter type="tag" name="priority" regex="(low|normal|high)" occurrence="optional" />
	</command>

</extension>