+{
+ my $s1 = PublicInbox::Eml->new($mime->as_string);
+ $s1->header_set('Sender', 's@example.com');
+ is(content_hash($s1), $orig, "Sender ignored when 'From' present");
+ my $s2 = PublicInbox::Eml->new($s1->as_string);
+ $s1->header_set('Sender', 'sender@example.com');
+ is(content_hash($s2), $orig, "Sender really ignored 'From'");
+ $_->header_set('From') for ($s1, $s2);
+ isnt(content_hash($s1), content_hash($s2),
+ 'sender accounted when From missing');
+}