Prevent a message from be deleted but not from be moved

[Reindl Harald]

Am 21.11.2014 um 14:00 schrieb Bruno Galindro da Costa:
> Is it possible to prevent a message from be deleted but not from be moved
> to another mailbox via ACL?
>
> I need this because I'm using antispam plugin with the mailtrain backend.
> It calls a script every time a message is moved to/from a monitored spam
> mailbox. But, if the user deletes a message from the spam folder, the
> script is executed with the option to train the antispam to consider that
> excluded message as a non spam.
>
> So, what I need is to prevent the user from delete a message from the spam
> mailbox, but I want to permit the user to move a menssage from the spam
> mailbox to another mailbox

simply: no

many if not most mail-clients in case of move issue two commands:

* copy to new folder
* delete from old folder

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