it would be nice if the postmaster prioritised higher quality items such as legendaries and exotics rather than blues, i just lost an exotic engram because my postmaster filled up with blues that i will never use.
or at least tell me when im in an activity that my postmaster is full rather than waiting till i am in orbit not doing anything
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Bungie has stated that the Postmaster isn't for storage. You also get an in-game message when it's getting full. They expanded the vault so you wouldn't have to store crap in the Postmaster. Either clean out your vault, or clean out your PM.