Authentication Requirements for Marketing Emails

We strongly advise that partners who send marketing emails authenticate their email addresses/domain with SPF, DKIM, and DMARC. Gmail and Yahoo have implemented changes to reduce the amount of spam email relayed through their systems by requiring that email marketers authenticate their DNS with SPF, DKIM and DMARC. If authentication is not in place, they will not deliver the email.

For more information, see How do I authenticate my From email address?