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

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

<extension name="vacation">

	<command name="vacation">
		<parameter type="tag" name="days" occurrence="optional" regex="days">
			<parameter type="number" name="period" />
		</parameter>

		<parameter type="tag" name="addresses" occurrence="optional" regex="addresses">
			<parameter type="stringlist" name="address strings" />
		</parameter>

		<parameter type="tag" name="subject" occurrence="optional" regex="subject">
			<parameter type="string" name="subject string" />
		</parameter>

		<parameter type="tag" name="from" occurrence="optional" regex="from">
			<parameter type="string" name="from string" />
		</parameter>

		<parameter type="tag" name="handle" occurrence="optional" regex="handle">
			<parameter type="string" name="handle string" />
		</parameter>

		<parameter type="tag" name="mime" occurrence="optional" regex="mime" />

		<parameter type="string" name="reason" />
	</command>

</extension>