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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Set yourself up a buffer. Empty your post master, send five or so blues to the post master without any purples mixed in. Now whenever you get the message you know only some junk got deleted instead of something useful. By being consistent you can plan around it.