[Dovecot] Make entire mailbox read-only (ACLs?)

[David Jonas]

Hello,

Is there a way of locking a mailbox, effectively making it read-only to
IMAP clients?

I've read through http://wiki2.dovecot.org/ACL. I created dovecot-acl
with the content "owner lr" in .INBOX which seems to keep me from
copying messages into the folder, but not out.

I have the plugin configured correctly, it seems, since MYRIGHTS command
shows the correct value:

  30 MYRIGHTS "INBOX"
  * MYRIGHTS "INBOX" lr

Am I barking up the wrong tree? Is there an easier way to lock a
mailbox? post-login scripting perhaps?

Thanks!