Someone told you to look into "Authenticated Replies" and "ARF," and now you're not sure which is which. Fair. They live in the same corner of the email world, but one is a standard you can use right now, and the other is still just an idea being kicked around. Let's split them cleanly.

Start with the one that's real. ARF stands for Abuse Reporting Format. It's a standard, written down in RFC 5965, and it's the format mailbox providers use to tell you someone hit the spam button on your mail.

Here's how you actually meet ARF. A reader at, say, harborpost dot net marks your email as spam. If that provider runs a Feedback Loop, they wrap up the original message in an ARF report and mail it back to you. You read it, you find who complained, and you stop sending to them. That's the whole loop.

Not everyone offers one. Gmail, for example, doesn't run a traditional Feedback Loop, so you won't get per-complaint reports from them the same way. Outlook and a lot of regional providers do. So setting up the loops that exist is worth doing, it's real, free complaint data straight from the source.

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Now the other one. Authenticated Replies is a newer idea, still being talked through in the standards community. It hasn't shipped. The concept is to stretch authentication, the same kind of cryptographic checking you get from SPF, DKIM, and DMARC, to cover replies too.

The problem it's aiming at: when someone replies to your email, could that reply be cryptographically tied back to your original authenticated message? If yes, it gets harder for an attacker to hijack a reply chain and pretend to be part of a conversation they were never in. Useful goal. Just not a button you can press today.

So, clean split. ARF is a real format, RFC 5965, powering the Feedback Loops you should set up now. Authenticated Replies is a direction of travel, worth watching, nothing to build yet. If you're tracking where authentication is heading, keep an eye on IETF updates.

Before chasing new proposals, it's worth knowing your current setup is solid. Next up, how to actually read your DMARC reports. And subscribe for the rest of the series.

ARF vs Authenticated Replies, explained. ARF (Abuse Reporting Format, RFC 5965) is the real, shipping format mailbox providers use to send you spam-complaint reports through Feedback Loops. Set the loops up, they're free complaint data. Authenticated Replies is a different, newer thing, an early standards proposal to extend SPF/DKIM/DMARC-style verification to reply flows so a reply can be tied back to the original authenticated message. It is not deployed and nothing you implement today. This video keeps the two apart and tells you which one actually matters right now.

Chapters:

0:00 Two acronyms, one real

0:20 What ARF is (RFC 5965)

0:45 The Feedback Loop, step by step

1:20 Who runs Feedback Loops

1:50 Authenticated Replies, the proposal

2:20 What it's trying to fix

2:45 Takeaway

Concepts in this video: ARF · Feedback Loop · Authenticated Replies · DMARC

Related: What is a feedback loop? · What is DMARC? · Will new RFCs replace SPF or DKIM?

Full written guide → reviewmyemails.com/emailalmanac ARF vs Authenticated Replies

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