If I buy more than two mailboxes, can I keep an amount of messages that is the addition of their capacities, or only the one that has the highest capacity?
Sorry if that's not clear, I woke up in Englishdumb mode ><.
If your asking what I think your asking, the mailbox capacities don't stack. So you're better off buying the one with the most capacity and only buy the ones with less if you want them as collectables.