-QUIT
-??? 221
-****
-# Client requests notification of deferral. First time of trying, the
-# queue-time probably has not hit the 1st retry time yet, so no DSN will
-# be sent and the message remains queued.
-client HOSTIPV4 PORT_D
-??? 220
-EHLO testclient
-??? 250-
-??? 250-SIZE
-??? 250-DSN
-??? 250 HELP
-MAIL FROM:<c@dump.ex>