diff --git a/test/data/mail/mail067.yml b/test/data/mail/mail067.yml
new file mode 100644
index 000000000..3e22fc297
--- /dev/null
+++ b/test/data/mail/mail067.yml
@@ -0,0 +1,7 @@
+--- !ruby/hash:ActiveSupport::HashWithIndifferentAccess
+from: Bob Smith | deal <info@example.de>
+from_email: info@example.de
+from_display_name: Bob Smith | deal
+subject: Testmail - Alias in info@example.de Gruppe
+content_type: text/plain
+body: no visible content
diff --git a/test/unit/email_parser_test.rb b/test/unit/email_parser_test.rb
index e61c2e5e0..c972d6c37 100644
--- a/test/unit/email_parser_test.rb
+++ b/test/unit/email_parser_test.rb
@@ -17,9 +17,17 @@ class EmailParserTest < ActiveSupport::TestCase
 
     messages.each do |m|
       # assert: raw content hash is a subset of parsed message hash
-      assert_operator(m[:content].except(:attachments), :<=, m[:parsed],
-                      "parsed message data from #{m[:source]} does not match " \
-                      "message content from #{m[:source].ext('yml')}")
+      expected_msg = m[:content].except(:attachments)
+      parsed_msg = m[:parsed].slice(*expected_msg.keys)
+      failure_msg = [parsed_msg, expected_msg]
+                      .map(&:to_a).map(&:sort).reduce(&:zip)
+                      .reject { |a| a.uniq.one? }
+                      .map { |a, b| "#{a.first.upcase}\n  #{m[:source]}: #{a.last}\n  #{m[:source].ext('yml')}: #{b.last}" }
+                      .join("\n")
+
+      assert_operator(expected_msg, :<=, parsed_msg,
+                      "parsed message data does not match message content:\n" +
+                      failure_msg)
 
       # assert: attachments in parsed message hash match metadata in raw hash
       next if m[:content][:attachments].blank?