backport patch to prevent email address encoding

bugzilla-email-encode.patch

@@ -0,0 +1,50 @@
+diff --git a/Bugzilla/MIME.pm b/Bugzilla/MIME.pm
+index 7b5843a..8c6c141 100644
+--- a/Bugzilla/MIME.pm
++++ b/Bugzilla/MIME.pm
+@@ -13,9 +13,6 @@ use warnings;
+ 
+ use parent qw(Email::MIME);
+ 
+-use Encode qw(encode);
+-use Encode::MIME::Header;
+-
+ sub new {
+     my ($class, $msg) = @_;
+     state $use_utf8 = Bugzilla->params->{'utf8'};
+@@ -79,20 +76,12 @@ sub as_string {
+     # MIME-Version must be set otherwise some mailsystems ignore the charset
+     $self->header_set('MIME-Version', '1.0') if !$self->header('MIME-Version');
+ 
+-    # Encode the headers correctly in quoted-printable
++    # Encode the headers correctly.
+     foreach my $header ($self->header_names) {
+         my @values = $self->header($header);
+-        # We don't recode headers that happen multiple times.
+-        next if scalar(@values) > 1;
+-        if (my $value = $values[0]) {
+-            utf8::decode($value) unless $use_utf8 && utf8::is_utf8($value);
+-
+-            # avoid excessive line wrapping done by Encode.
+-            local $Encode::Encoding{'MIME-Q'}->{'bpl'} = 998;
++        map { utf8::decode($_) if defined($_) && !utf8::is_utf8($_) } @values;
+ 
+-            my $encoded = encode('MIME-Q', $value);
+-            $self->header_set($header, $encoded);
+-        }
++        $self->header_str_set($header, @values);
+     }
+ 
+     # Ensure the character-set and encoding is set correctly on single part
+diff --git a/attachment.cgi b/attachment.cgi
+index 5db8f59..40b0c9d 100755
+--- a/attachment.cgi
++++ b/attachment.cgi
+@@ -26,6 +26,7 @@ use Bugzilla::Attachment::PatchReader;
+ use Bugzilla::Token;
+ 
+ use Encode qw(encode find_encoding);
++use Encode::MIME::Header; # Required to alter Encode::Encoding{'MIME-Q'}.
+ 
+ # For most scripts we don't make $cgi and $template global variables. But
+ # when preparing Bugzilla for mod_perl, this script used these