I wrote:
A more practical use of CNAMEs regarding DKIM might be more like this:
[broken example]. Make that...
foo._domainkey.sub1.domain.com CNAME foo._domainkey.domain.com
foo._domainkey.sub2.domain.com CNAME foo._domainkey.domain.com
foo._domainkey.sub3.domain.com CNAME foo._domainkey.domain.com
foo._domainkey.sub4.domain.com TXT "subdomain 4 key record"
foo._domainkey.domain. com TXT "normal domain key record"
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