221 Bye
****
exim -bs
+helo test
mail from:<userx@broken.example>
quit
****
221 Bye
****
exim -bs
+helo test
mail from:<userx@ok.example>
rcpt to:<usery@broken.example>
quit
****
# A final check that the cache works for sender address
exim -bs
+helo test
mail from:<userx@broken.example>
quit
****