Setting Google Apps Domain Key in DNS

Enable DKIM in Google Apps control panel

Create or Modify DNS

1. Creare new TXT Record name google._domainkey
2. enter value that you generated from google apps below the line TXT record value example: v=DKIM1; k=rsa; t=y; p=MIGfMA....

Verify DNS

1. open nslookup
2. type set type=txt
3. type google._domainkey.yourdomain.com you will see output like this
(but google._domainkey.yourdomain.com is not subdomain)


Server: google-public-dns-a.google.com
Address: 8.8.8.8

Non-authoritative answer:
google._domainkey.yourdomain.com text =

"v=DKIM1; k=rsa; t=y; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCzx1zk4E0J
LunrLqQ34OcUWIHpVRz1iJMeWygSaXNpkKCocWKLeBJyipkKmSlrsilAh4qmj0r+jQ7rGTM1Kc+hzVnlZzfFfUqidY0JyW2TpXY6zatSS2QAhjLv2Wn2p1WL6ABX0f4hKqwzg9CuvK80zJhDuuXH3MkRApNs4fN/gQIDAQAB"

Note
- In google apps if click show detail in email you will see information like this:

mailed-by yourdomain.com <- if you use SFP record in DNS
signed-by yourdomain.com <- if you enable DKIM