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Re: slight update to draft-macdonald-antispam-registry

2011-05-14 08:05:38

Jeff, based on the thread in DKIM

You might wish to consider adding a new X.8.27 extended status code for ADSP related rejects:

   554 5.8.27 Message refused by ADSP From.Domain=<IDENTITY>

If acceptable, I'm sure Murray can help provide the description as it relates to DKIM-aware MLM using this 5.8.27 detection to avoid creating erroneous automated unsubscribing notifications to members with DKIM-ADSP ready mail host receivers.


Hector Santos

Jeff Macdonald wrote:
Hi Folks,

There is a slight update, where I added a code for greylisting. I've
also updated the contact information to reflect my current job.

Draft can be found here:

Suggested values for SMTP Enhanced Status Codes for Anti-Spam Policy


   This document establishes a set of extended SMTP policy codes for
   anti-spam.  It seeks to provide additional codes for error texts that
   currently use the extended SMTP error code 5.7.1.  The anti-spam
   codes were determined by looking at error texts produced by major
   ISPs and finding commonalities.  The result is a new set of error
   texts with associated extended SMTP error codes.

There is an implementation at my former job:

$ telnet 25
Connected to
Escape character is '^]'.
550 5.8.3 Listed on RBL Zen: See

Here I tried to connect to the inbound MX at e-Dialog, from my home
over Comcast cable. This is a residential connection so the listing
makes sense (it is actually a PBL listing).
I've changed the IP to keep spammers at bay.

If you've implemented this draft, please let me know.