How to Delete an user and Purge attachements with a common directory mail_attachment_dir with SIS for all users.

[TN]

         Hello everybody,

    What is the best way to delete an user mailbox (ex: 
/var/mail/johndoe ) when all attachments  (for all users) are in a 
common directory with SIS deduplication (ex: mail_attachment_dir = 
/var/mail/attachments ) ?

Trying to delete user mailbox directory (rm) and do the command  : 
doveadm -v purge -u johndoe    leave  all johndoe's attachments orphelin.

Best regards,
TN