What is a DMARC record ?

DMARC stands for “Domain-based Message Authentication, Reporting & Conformance.”  DMARC is built upon two other authentication protocols: SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail).  DMARC policy tells a receiving server how to handle an incoming email claiming to be coming from a particular domain.
Publishing a DMARC record protects your brand by ensuring that email is properly authenticating against DKIM and SPF standards, and that any fraudulent activity appearing to come from your domain is timely blocked.

You can use this tool to generate DMARC Record.

How to create a DMARC record

You can configure DMARC by adding policies to your domain’s DNS as TXT records.  The TXT record read as “_dmarc.your_domain.com.”  You need to replace your_domain.com with your domain for which you are creating the DMARC record.
Here are common tags used in DMARC TXT records:
Tag Name Required Purpose Sample
v required Protocol version v=DMARC1
p required Policy for domain p=reject (or quarantine or normal)
pct optional % of messages subjected to filtering pct=50
rua optional Reporting email address of aggregate reports rua=mailto:[email protected]_domain.com
ruf optional Addresses to which message-specific forensic information is to be reported (comma-separated plain-text list). ruf=mailto:[email protected]_domain.com
rf optional This part tells the receiving server what kind of reporting the policyholder wants (comma-separated plain-text list of values). rf=afrf
aspf optional Alignment mode for SPF aspf=r
sp optional Policy for subdomains of the domain sp=r
adkim optional Alignment mode for DKIM adkim=r
You can generate your DMARC record using our DMARC generator. Once you have generated the record you would need a TXT record in your domain’s DNS.
Creating a TXT record with the appropriate name and value is different for every domain host.

For most of the cases it looks like this record of postboxservices.com :

 

 

Contact us if you need help generating or setting the DMARC record.

 

Other Resources

DMARC.org’s FAQ – https://dmarc.org/wiki/FAQ

 

*Featured Image courtesy – Zimbra Wiki
Tags: