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-rwxr-xr-xDocumentation/standards.perl4
-rw-r--r--examples/unsubscribe.milter7
2 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/standards.perl b/Documentation/standards.perl
index 32003c91..69568ceb 100755
--- a/Documentation/standards.perl
+++ b/Documentation/standards.perl
@@ -62,6 +62,10 @@ my $rfcs = [
         # 8621 => JSON Meta Application Protocol (JMAP) for Mail
         # ...
 
+        # examples/unsubscribe.milter and PublicInbox::Unsubscribe
+        2369 => 'URLs as Meta-Syntax for Core Mail List Commands',
+        8058 => 'Signaling One-Click Functionality for List Email Headers',
+
         # TODO: flesh this out
 
 ];
diff --git a/examples/unsubscribe.milter b/examples/unsubscribe.milter
index 04a39761..216b0ddd 100644
--- a/examples/unsubscribe.milter
+++ b/examples/unsubscribe.milter
@@ -1,5 +1,5 @@
 #!/usr/bin/perl -w
-# 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>
 use strict;
 use Sendmail::PMilter qw(:all);
@@ -96,6 +96,7 @@ $cbs{eom} = sub {
 
                 my $unsub = $priv->{header}->{'list-unsubscribe'} || [];
                 my $n = 0;
+                my $added;
                 foreach my $u (@$unsub) {
                         # Milter indices are 1-based,
                         # not 0-based like Perl arrays
@@ -114,7 +115,11 @@ $cbs{eom} = sub {
                         $v .= ",\n <https://$domain/u/$u/$list>";
 
                         $ctx->chgheader($k, $index, $v);
+                        $added = 1;
                 }
+                # RFC 8058
+                $added and $ctx->addheader('List-Unsubscribe-Post',
+                                        'List-Unsubscribe=One-Click');
         };
         warn $@ if $@;
         SMFIS_CONTINUE;