DMARC does not govern inbox placement. If you have DKIM fully in place, implementing Sender Policy Framework (SPF) with your own custom domain likely isn’t adding anything positive to a mailbox provider’s view of you. A customized SPF domain that ‘aligns with’ (is part of the same domain as) your from domain helps prevent some messages from failing DMARC.
Excerpt from the main article:
The other day, I ran across a complaint on Linkedin. “Just saw another email go to the Promotions Folder with DKIM, SPF, and DMARC set up perfectly. Stop telling people this will fix their e-mail problems!” It’s not the first time I’ve heard this, and I can understand why the author is frustrated. But, it’s important not to miss the true point — email authentication will help to improve inbox delivery. Because it does! But there’s a nuanced explanation to go along with that. The devil truly is in the details. Email authentication is fantastic. SPF and DKIM both allow you …
Email authentication, fact vs fiction was originally published on Spam Resource: All Things Deliverability
