SMTP<< 250 Sender OK
SMTP>> RCPT TO:<userx@domain.com>
cmd buf flush ddd bytes
+sync_responses expect rcpt
SMTP<< 250 Recipient OK
SMTP>> DATA
cmd buf flush ddd bytes
+sync_responses expect data
SMTP<< 354 Send data
SMTP>> writing message and terminating "."
cannot use sendfile for body: spoolfile not wireformat