cmd buf flush ddd bytes
SMTP<< 354 Send data
SMTP>> writing message and terminating "."
+cannot use sendfile for body: spoolfile not wireformat
writing data block fd=dddd size=sss timeout=300
SMTP<< 250 OK
ok=1 send_quit=1 send_rset=0 continue_more=0 yield=0 first_address is NULL