I am trying to determine if I have configured DKIM correctly. I have tried some of the validators like the one specified here and apparently things are ok.
Also, when i send mail from my Gmail hosted domain to a yahoo email account things are fine. However, when I send mail from an alias at the same domain to a yahoo account, there is no DKIM-Signature header included. Also the header says,
dkim=neutral (no sig)
After reading [here](https://support.cloudflare.com/hc/en-us/articles/200168696-How-do-I-add-DKIM-records- I saw this
Some services require additional CNAME records for DKIM verification. CNAME DKIM records should be gray clouded; otherwise, the record value won’t be available and verification will fail.
I don’t know if that is relevant here or not. I don’t see any advice on how to set up a CNAME record for DKIM verification.