THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
...
Then you need to download an updated sa-update key.
As \[http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5775 bug 5775\] describes, the GnuPG developers decided to create a new error condition for a potentially-dangerous signature style, which unfortunately was one we use for the [SpamAssassin] update-signing key. Wiki Markup
Running this should fix it:
...