Author Domain Signing Practices (ADSP) is an add-on to DKIM email authentication. It provided domain owners with the ability to define a policy that asks mailbox providers to discard (throw away) email messages if not properly signed. The specification is defined in RFC 5617. It was defined long ago, the RFC document being formally published in August 2009. ADSP was never broadly adopted as should be considered extinct.
I consider DMARC to be a replacement for and somewhat of a descendent of ADSP. DMARC effectively supersedes ADSP, includes more functionality, and supports multiple times of email authentication (SPF and DKIM), not just DKIM.
Why do I bring up ADSP now? Because I recently saw someone post somewhere asking for help with email deliverability issues, and when relating their technical settings, they indicated that they had implemented ADSP. (I wish I could remember where I saw this, so I could link to it!) I am posting this information here with a very clear statement: ADSP is outdated, not utilized, and there’s no need to implement it, and no value in doing so.
Implementing ADSP today probably doesn’t harm deliverability as nobody will ever check or act upon your ADSP settings. But because it won’t actually do anything, that means it won’t do anything good to help you with email deliverability or domain protection.
Author Domain Signing Practices (ADSP) is an add-on to DKIM email authentication. It provided domain owners with the ability to define a policy that asks mailbox providers to discard (throw away) email messages if not properly signed. The specification is defined in RFC 5617. It was defined long ago, the RFC document being formally published in August 2009. ADSP was never broadly adopted as should be considered extinct.
I consider DMARC to be a replacement for and somewhat of a descendent of ADSP. DMARC effectively supersedes ADSP, includes more functionality, and supports multiple times of email authentication (SPF and DKIM), not just DKIM.
Implementing ADSP today probably doesn’t harm deliverability as nobody will ever check or act upon your ADSP settings. But because it won’t actually do anything, that means it won’t do anything good to help you with email deliverability or domain protection.
Want to learn more about deliverability terminology? If so, be sure to visit the DELIVTERMS section here on Spam Resource.
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