So, in January I started using a YubiKey for my PGP needs. I made a new PGP key for it and signed it with my old one (to show that I "acknowledge" my new key)
On April 2nd my old key expired. I didn't care as I don't use it any more. However, Thunderbird didn't allow me to send an email, because my new key was signed with an expired key. So, I had to prolong it before doing so.
Is it a Thunderbird bug or a PGP feature? What is the correct way of dealing with expired keys' signatures?
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