??? 550
quit
****
+client HOSTIPV4 PORT_D
+??? 220
+helo testclient
+??? 250
+mail from:<b@test.example.com>
+??? 250
+rcpt to:<fred@test.ex>
+??? 550
+quit
+****
client 127.0.0.1 PORT_D
??? 220
helo testclient
??? 250
-mail from:<b@example.com>
+mail from:<c@example.com>
??? 250
rcpt to:<fred@test.ex>
??? 250