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-rw-r--r--lib/PublicInbox/Eml.pm7
-rw-r--r--t/filter_subjecttag.t10
2 files changed, 15 insertions, 2 deletions
diff --git a/lib/PublicInbox/Eml.pm b/lib/PublicInbox/Eml.pm
index ec682b91..1fecd41b 100644
--- a/lib/PublicInbox/Eml.pm
+++ b/lib/PublicInbox/Eml.pm
@@ -368,9 +368,12 @@ sub header_str_set {
         my ($self, $name, @vals) = @_;
         for (@vals) {
                 next unless /[^\x20-\x7e]/;
-                utf8::encode($_); # to octets
                 # 39: int((75 - length("Subject: =?UTF-8?B?".'?=') ) / 4) * 3;
-                s/(.{1,39})/'=?UTF-8?B?'.encode_base64($1, '').'?='/ges;
+                s/(.{1,39})/
+                        my $x = $1;
+                        utf8::encode($x); # to octets
+                        '=?UTF-8?B?'.encode_base64($x, '').'?='
+                /xges;
         }
         header_set($self, $name, @vals);
 }
diff --git a/t/filter_subjecttag.t b/t/filter_subjecttag.t
index 75effa27..e2d91e74 100644
--- a/t/filter_subjecttag.t
+++ b/t/filter_subjecttag.t
@@ -24,4 +24,14 @@ $mime->header_str_set('Subject', '[FOO] bar');
 $mime = $f->delivery($mime);
 is($mime->header('Subject'), 'bar', 'filtered non-reply');
 
+$f = PublicInbox::Filter::SubjectTag->new(-tag => '[sox-devel]');
+my $eml = PublicInbox::Eml->new(<<EOF);
+Subject: Re: [SoX-devel] =?utf-8?b?xaE?=
+
+EOF
+$eml = $f->delivery($eml);
+my $s = $eml->header('Subject');
+utf8::encode($s); # to octets
+is($s, "Re: \xc5\xa1", 'subject filtered correctly');
+
 done_testing();