My fault - you were actually using the term "mailbox" correctly! I work with Windows guys who never refer to them as anything but "folders" and it rubs off. I was assuming multiple servers/accounts in my previous reply.
Ok, fair enough. Maybe there should be an MSELECT extension that specifies on which mailboxes the following commands should be run...
Ugh, then you have a modal response set, as responses run after an MSELECT will need to include a mailbox name as well as whatever ordinary response they give.
Maybe better to define a MULTISEARCH extension that returns "mailbox/message#"... results. Should we talk to the LEMONADE guys? :)