Top Deliverability’s Blog
DMARCIAN: DMARC’s Subdomain Policy (sp) Tag
- June 23, 2023
- Posted by: Top Deliverability
- Category: DMARC DMARCIAN Email Authentication Email Services Industry News
DMARCIAN just issued another insightful story:
We often get questions about how DMARC policies apply to subdomains and how to establish a subdomain policy. Here’s some information to provide clarity and answer those questions. Because subdomains contend with the same abuse potential as parent domains, aka top-level or root domains, the astute authors of the DMARC control wrote specific conditions for subdomain policies. It goes like this: subdomains inherit the parent domain’s DMARC policy unless you indicate a subdomain policy using the sp= tag in the parent DMARC record or publish a p= tag on a subdomain. Keeping in mind that cybercriminals leverage unprotected subdomains for phishing exploits, it’s important to have a DMARC deployment plan for every subdomain you create, whether the parent domain DMARC policy is inherited, an sp= tag is published to rule the subdomains, or a p= tag is indicated for the subdomain. The DMARC policy definitions and actions apply to subdomain
Read more here: DMARC’s Subdomain Policy (sp) Tag
P.S. Do you need help with Email Authentication? Ask for a Consultation
Leave a Reply Cancel reply
Email Service Providers Handbook
The most comprehensive “Handbook of Email Service Providers“!
SPAMASSASSIN RULES
All SpamAssassin rules in one place, EXPLAINED!
SMTP COMMANDS
& REPLY CODES
All SMTP/ESMTP commands and reply codes in one place, EXPLAINED!
Free DNS Tool
Check the DNS records of your domain with our free DNS tool.
Deliverability Glossary
The most comprehensive Email Deliverability and Marketing Glossary!