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I am looking for roughly how to generate new DKIM keys without effecting existing mail. It sounds like the only concern is mail in transit. Is there a common procedure for doing this?
You would generate a new key pair. Publish it in a new new selector._domainkey.example.com.
Wait for the new selector to propagate in DNS.
Update your e-mail system to use the new selector.
After a week or so, remove the old selector DNS record.