sa-update: error: GPG validation failed!
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When updating the SpamAssassin rules I encountered the following error:

error: GPG validation failed!
The update downloaded successfully, but the GPG signature verification failed.
channel: GPG validation failed, channel failed

The solution isn't too hard fortunately, but I couldn't find it from 'official' resources.

$ wget http://spamassassin.apache.org/updates/GPG.KEY
$ sa-update --import GPG.KEY