+# double header, multi-sign
+exim -DOPT=From:=X-Mine -odf b12@test.ex
+From: nobody@example.com
+X-mine: one
+X-mine: two
+
+content
+****
+#
+#
+# no header, always-oversign
+exim -DOPT=+X-Mine -odf b20@test.ex
+From: nobody@example.com
+
+content
+****
+#
+# double header, always-oversign
+exim -DOPT=+X-Mine -odf b22@test.ex
+From: nobody@example.com
+X-mine: one
+X-mine: two
+
+content
+****
+#
+## default header set
+# cannot test that as it includes Date: so results in a varying signature
+#exim -DHEADERS_MAXSIZE=y -odf c@test.ex
+#From: nobody@example.com
+#
+#content
+#****
+##