sieve-filter(1) on Linux
The text b8d12ee9b9ec, as Debian 10 (Buster) shipped it.
Pigeonhole's Sieve mailbox filter tool WARNING: This tool is still experimental. Read this manual carefully, and backup any important mail before using this tool. Also note that some of the features documented here are not actually implemented yet; this is clearly indicated where applicable.
Flags it lists
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-C -
-D -
-W -
-c -
-e -
-m -
-o -
-u -
-v -
-x