+550 Bad-char error for <> topbitchar:\x80\xFF\xFF
+QUIT
+250 OK
+****
+# sender, err on mailfrom, with bad char
+sudo exim -v -bs -oMa V4NET.0.0.1
+HELO test
+MAIL FROM:<uncheckable2@localhost1>
+RCPT TO:<z@test.ex>
+QUIT
+****
+# sender, fail to bind local IP
+sudo exim -v -bs -oMa V4NET.0.0.1
+HELO test
+MAIL FROM:<bindfail@localhost1>
+RCPT TO:<z@test.ex>
+QUIT
+****
+#
+#
+#
+#
+server PORT_S
+220 Server ready
+EHLO
+250 OK
+MAIL FROM