Step 1: First we need to "Enable the DKIM in Office 365"
Step 2: When we "Click" to "Enable the DKIM", it will show you the below message
Step 3: Copy the whole message and ADD in CNAME , just same as below table We need to add the CNAME Record in DNS.
| mpmct.com |
| Host name: selector1._domainkey |
| Points to address or value: selector1-mpmct-com._domainkey.mpmct.onmicrosoft.com |
| TTL: 3600 |
| Host name: selector2._domainkey |
| Points to address or value: selector2-mpmct-com._domainkey.mpmct.onmicrosoft.com |
| TTL: 3600 |
| gfsmct.com |
| Host name: selector1._domainkey |
| Points to address or value: selector1-gfsmct-com._domainkey.mpmct.onmicrosoft.com |
| TTL: 3600 |
| Host name: selector2._domainkey |
| Points to address or value: selector2-gfsmct-com._domainkey.mpmct.onmicrosoft.com |
| TTL: 3600 |
Step 4: Once it got Published you will able to Enable the DKIM. After Adding the CNAME record in DNS Control panel. It will take 8 Hours to publish in the DNS .
Check the below Screenshot.
Step 5: Next Steps is to ADD the DMARC TXT Record in the DNS Control Panel.
Please find how to create the DMARC TXT Record.
| TXT record |
| domain: _dmarc.gutech.edu.om |
| TXT value: v=DMARC1; p=none; rua=mailto:user@domain.com; ruf=mailto:user@domain.com; |
| sp=none; ri=86400; |
| TTL 3600 |
Example:
_dmarc.contoso.com 3600 IN TXT "v=DMARC1; p=none"
_dmarc.contoso.com 3600 IN TXT "v=DMARC1; p=quarantine"
_dmarc.contoso.com 3600 IN TXT "v=DMARC1; p=reject"
Once this record is published. You can use these reports to authenticate all of your email if you have published p=none so that you can eventually move to p=reject.
Source: https://blogs.technet.microsoft.com/fasttracktips/2016/07/16/spf-dkim-dmarc-and-exchange-online/