(2) If you use gpg and someone on your keyring with two keys has merged them, you might need to delete the old key with gpg --delete-keys <key_id>
If you don't Enigmail might keep using the old 'dead' key to encrypt mail to them when you don't want it to.

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"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko