What does dis=NONE mean in an email's Authentication-Results header?

The following is from an email I received recently:

Authentication-Results: mx.google.com;
       spf=neutral;
       dkim=pass [email protected];
       dmarc=pass (p=REJECT dis=NONE) header.from=yahoo.com

I've been reading about SPF, DKIM, and DMARC, but I haven't found any explanation of what dis=NONE means. "dis" isn't listed in the DMARC tag registry, so where is it defined and what does it mean?

Solution 1:

dis=none (disposition=none) -- means that Gmail applied "none" policy

http://lists.dmarc.org/pipermail/dmarc-discuss/2013-April/001848.html

Solution 2:

Wikipedia currently explains this very well:

--

The disposition reflects the policy published actually applied to the messages, none, quarantine, or reject. Along with it, not shown in the table, DMARC provides for a policy override. Some reasons why a receiver can apply a policy different from the one requested are already provided for by the specification:

• forwarded: while keeping the same bounce address, usually doesn't break DKIM,
• sampled out: because a sender can choose to only apply the policy to a percentage of messages only,
• trusted forwarder: the message arrived from a locally known source
• mailing list: the receiver heuristically determined that the message arrived from a mailing list,
• local policy: receivers are obviously free to apply the policy they like, it is just cool to let senders know,
• other: if none of the above applies, a comment field allows to say more.

--

For more detail see RFC 7489.