Office 365: Creating DKIM and DMARC records
DKIM
Enable/locate DKIM records
https://security.microsoft.com
Navigate to Policies & Rules > Threat Policies > Email authentication settings > DKIM (Tab) - or -
Search for DKIM
Create CNAME records (2) (DNS Records)
DMARC
Create DMARC record (DNS Records)
Viewing Quarantine Messages in Office 365 Portal
Https://security.microsoft.com
Navigate to Reports > Quarantine