DKIM keys for specific domains + multiple domains

[John Luk]

Thank you so much Marc!  for the clear explanations.  You are right.  Now
everything makes sense.

And to answer my initial question about how to check to make sure domain1
is not signed by the new key, we can first create a amavis-test.conf, then
use the following commands to check whether signing is correct with this
conf:

amavisd -c amavis_test.conf showkeys
amavisd -c amavis_test.conf showkeys .org domain1
amavisd -c amavis_test.conf testkeys
amavisd -c amavis_test.conf testkeys .org domain1
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