The table for balsa has an 'n' for 'import key'. Perhaps I misunderstand its meaning, but one of the things I noticed when using balsa was that if you got a signed message from someone who's key you didn't have, it has a nice button marked 'get key for this sender' or similar. Click on that and now it tells you that the message checked out, rather than telling you that it couldn't confirm the signature.
So for me that means balsa has exrememly simple GPG key import support - the sort that means any fool can use it.
I've only used balsa for a few messages and test purposes, so I could be confused about all this...
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