What is DMARC
DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is an email authentication, policy, and reporting protocol.
To improve the security of emails, many popular email inbox providers (Gmail, yahoo, etc) will display email readers a warning if the sending address of the email is not validated by the DNS records of that domain.
This protects users from email "Phishing" attacks in which a 3rd party will attempt to collect login credentials by pretending to be an authorized company user.
This is how it would look for your partners:
Because PartnerStack sends emails on behalf of your company's domain name, you'll need to take a few simple steps to allows us to send on your behalf.
Step 1. Contact Support
Contact the PartnerStack support team at email@example.com and mention "DMARC".
Support will provide the CNAME records you'll need to add to your DNS records
Step 2. Add CNAME records to your DNS
Add the three CNAME records to your DNS as given to you by support.
You may need to contact a technical resource at your company to have these records added.
Once added, let support know and they will be able to validate the it has worked correctly
With the correct DNS records added, PartnerStack emails to your partners will be signed and verified by your Domain allowing your emails to be successfully delivered to your partners.