DMARC record

DMARC is a system that adds some rules for DKIM and SPF, so remote servers have a better idea of what your intention is for messages that fail those 2 systems.

DMARC requires both the SPF and DKIM to be present in order to work.

references

• http://techarena51.com/index.php/what-is-dmarc-and-how-you-can-add-it/

To add a DMARC record, go to your domain's DNS Management,

• https://help.directadmin.com/item.php?id=596