Any DKIM-Signature header fields using the "i=" tag MUST have the same domain value on the right-hand side of the "@" in the "i=" tag and the value of the "d=" tag. That is, the "i=" domain MUST NOT be a subdomain of "d=". Use of this flag is RECOMMENDED unless subdomaining is required.
10. Is it possible to add other optional tags to the DKIM DNS record such as: "s=" "n=" "k=" "h=" "g=" without affecting email delivery ?
Yes, although the use of these optional tags is very limited.
11. Why does the DNS verification check does not successfully complete after adding optional tags?
Because there is no longer a 1:1 match between the record provided in ClientNet and the record added in the DNS, it will continuously fail. You may still override this check and enable the setting anyway.
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