DMARC stands for Domain-based Message Authentication, Reporting and Conformance.
Typically, it's none, quarantine or reject.
Setting DMARC record may help messages sent from your domain avoid the spam folder, since some email providers seem to be rewarding email senders who have a DMARC policy set.
If you want help setting up your DMARC records, please email or call support. It can be tricky and we are here to help.
If you would like to set an SPF record for your domain name, please follow our guide on preparing your domain name to send email.