[PATCH 4/4] doc: update README.unsubscribe

[Eric Wong <e@80x24.org>]

The whitelist was only used in the early days of its development
and hasn't existed for a while.  I've largely forgotten this
thing exists since it's been working well...
---
 examples/README.unsubscribe | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/examples/README.unsubscribe b/examples/README.unsubscribe
index 3e80e838..3b407960 100644
--- a/examples/README.unsubscribe
+++ b/examples/README.unsubscribe
@@ -3,10 +3,9 @@ Unsubscribe endpoints for mlmmj users (and possibly Mailman, too)
 * examples/unsubscribe.milter filters outgoing messages
   and appends an HTTPS URL to the List-Unsubscribe header.
   This List-Unsubscribe header should point to the PSGI
-  described below.
-  Currently, this is only active for a whitelist of test
-  addresses in /etc/unsubscribe-milter.whitelist
-  with one email address per line.
+  described below.  You may edit the archive_addr sub
+  to disable List-Unsubscribe headers for well-known archiver
+  addresses to prevent saboteurs from stopping archival.
 
 * examples/unsubscribe.psgi is a PSGI which needs to run
   as the mlmmj user with permission to run mlmmj-unsub.
@@ -36,5 +35,5 @@ in /etc/postfix/main.cf:
   # This is not needed for mlmmj since mlmmj uses SMTP:
   # non_smtpd_milters = local:/var/spool/postfix/unsubscribe/unsubscribe.sock
 
-Copyright (C) 2016-2021 all contributors <meta@public-inbox.org>
+Copyright (C) all contributors <meta@public-inbox.org>
 License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>