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-rw-r--r--lib/PublicInbox/Reply.pm9
-rw-r--r--t/plack.t1
2 files changed, 7 insertions, 3 deletions
diff --git a/lib/PublicInbox/Reply.pm b/lib/PublicInbox/Reply.pm
index d96fadfc..592dfb62 100644
--- a/lib/PublicInbox/Reply.pm
+++ b/lib/PublicInbox/Reply.pm
@@ -1,10 +1,10 @@
-# Copyright (C) 2014-2021 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>
 
 # For reply instructions and address generation in WWW UI
 package PublicInbox::Reply;
 use strict;
-use warnings;
+use v5.10.1;
 use URI::Escape qw/uri_escape_utf8/;
 use PublicInbox::Hval qw(ascii_html obfuscate_addrs mid_href);
 use PublicInbox::Address;
@@ -81,7 +81,6 @@ sub mailto_arg_link {
                 # no $subj for $href below
         } else {
                 push @arg, "--to=$to";
-                $to = uri_escape_utf8($to);
                 $subj = uri_escape_utf8($subj);
         }
         my @cc = sort values %$cc;
@@ -106,6 +105,10 @@ sub mailto_arg_link {
         # anyways.
         return (\@arg, '', $reply_to_all) if $obfs;
 
+        # keep `@' instead of using `%40' for RFC 6068
+        utf8::encode($to);
+        $to =~ s!([^A-Za-z0-9\-\._~\@])!$URI::Escape::escapes{$1}!ge;
+
         # order matters, Subject is the least important header,
         # so it is last in case it's lost/truncated in a copy+paste
         my $href = "mailto:$to?In-Reply-To=$irt${cc}&Subject=$subj";
diff --git a/t/plack.t b/t/plack.t
index e4dedce6..a5fd54c9 100644
--- a/t/plack.t
+++ b/t/plack.t
@@ -85,6 +85,7 @@ test_psgi($app, sub {
         my ($cb) = @_;
         my $res = $cb->(GET('http://example.com/test/crlf@example.com/'));
         is($res->code, 200, 'retrieved CRLF as HTML');
+        like($res->content, qr/mailto:me\@example/, 'no %40, per RFC 6068');
         unlike($res->content, qr/\r/, 'no CR in HTML');
         $res = $cb->(GET('http://example.com/test/crlf@example.com/raw'));
         is($res->code, 200, 'retrieved CRLF raw');