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I suspect the automaton possible with something like JavaScript being the culprit, and the email client's "features" bring far to cooperative... possibly linked with storing plain text after initial (and automatic) decryption of incoming messages.
If it's a crypto problem it could be something like using "invalid" keys (e.g. RSA > modulus) that when decrypted, the success or failure thereof leaks one bit of your key, and then you use image embeds to ping back the result.
hmm, interesting. If so, I wonder why they only identify email as a remedial step... "immediately disable and/or uninstall tools that automatically decrypt PGP-encrypted email"
My cynical guess is they only looked at the email use case and are negligently ignoring everything else.
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