cyrus-cyr_expire(8) on Linux
The text 6d10ad6b7a72, as Debian 11 (Bullseye) shipped it.
Cyrus IMAP documentation Expire messages and duplicate delivery database entries
Flags it lists
-
-A -
-C -
-D -
-E -
-X -
-a -
-c -
-p -
-t -
-u -
-v -
-x