Preventing mbox deletion

[Ciprian Marius Vizitiu (GBIF)]

Hi everybody,

Do the old 2.2.x flags mean the same thing in 2.3.7? I'm trying to give 
a user maximum on a mailbox except for mailbox deletion. I thought 
"lrswipte" would do the trick but if I sam the box like that it also 
acquires "d" which used to mean "allow for delete of both messages and 
mailbox". So, what would be the magic combination of flags to allow an 
user to subscribe, read, post and delete messages but prevent deletion 
of the mailbox?