On 16 Sep 2016 18:22:33 -0000, "John Levine" said:

> There are some issues with helpful spam filters that fetch the URLs in
> list-unsubscribe headers to see if they lead somewhere malicious, but
> they're not all that hard to deal with.

For those who don't know what John is referring to:

Subject: I-D Action: draft-levine-herkula-oneclick-03.txt
From: internet-dra...@ietf.org
Date: Tue, 09 Aug 2016 01:05:56 -0700 (04:05 EDT)
To: <i-d-annou...@ietf.org>

A New Internet-Draft is available from the on-line Internet-Drafts directories.

        Title           : Signalling one-click functionality for list email 
        Authors         : John Levine
                          Tobias Herkula
        Filename        : draft-levine-herkula-oneclick-03.txt
        Pages           : 7
        Date            : 2016-08-09

   This document describes a method for signaling a one-click function
   for the list-unsubscribe email header.  The need for this arises out
   of the actuality that mail software sometimes fetches URLs in mail
   headers, and thereby accidentally triggers unsubcriptions in the case
   of the list-unsubscribe header.

The IETF datatracker status page for this draft is:

There's also a htmlized version available at:

A diff from the previous version is available at:

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