http://postmaster.aol.com/Postmaster.DKIM.html
Interesting to see they plan to use i= for reputation. I'm now starting to see
this trend on the big mail providers...
* How are you using DKIM options like i=, d=, or z=?
o We will use d= to establish the reputation of your domain. Future plans
include using portions of i= as the basis in assessing reputation for
sub-domains.
* What should the signer do to make AOL's use of the signature more helpful?
o Use d= as your primary domain. Use i= to separate your mail into distinct
classes of reputation.
Example: Your Bank sends marketing mail and transactional bank statements.
* d=yourbank.com
* i=statements.yourbank.com and i=marketing.yourbank.com
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