doveadm-mail-fs(1) on Linux
The text 974290e8428d, as Debian 13 (Trixie) shipped it.
Interact with the abstract mail storage filesystem in user context
Flags it lists
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-A -
-D -
-F -
-O -
-R -
-S -
-c -
-f -
-h -
-i -
-k -
-m -
-n -
-o -
-u -
-v