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Spam Resource: DMARC at the subdomain level: When and why?
- March 21, 2022
- Posted by: Top Deliverability
- Category: Industry News Spam Resource
Al Iverson just released a brilliant article on Spam Resource:
The intent behind DMARC (Domain-based Message Authentication, Reporting and Conformance) is to give a domain owner insight into who is sending mail using their domain and allow that domain owner to define a policy to tell ISPs what to do with mail that purports to be from them but doesn’t pass authentication checks (usually meaning that said mail is fraudulent). There’s a strong implication here that this is a domain level setting, it’s something that you would do at the highest possible level for your domain. Meaning here, I’d set a DMARC policy for spamresource.com, not for subdomains like newsletter.spamresource.com or email.spamresource.com. And generally speaking, that’s what you should do. It’s what I (usually) do.But what if you want to get granular and do this differently with one or more (or all) subdomains of your domain name? Here are some options.Do nothing (at the subdomain level). Maybe you’ll set a…
Read the original here: DMARC at the subdomain level: When and why?
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