rcpt to:<x@y>
quit
****
+# This resolves to a name which will give `try again' when looked up
+exim -bh V4NET.99.99.96
+mail from:<>
+rcpt to:<x@y>
+quit
+****
+exim -bh V4NET.99.99.96
+mail from:<>
+rcpt to:<defer_ok@y>
+quit
+****
exim -bh 29.29.29.29
mail from:<a@localhost>
rcpt to:<x@y>