LOG: smtp_connection MAIN
  SMTP connection from CALLER
LOG: MAIN
  <= x@y U=CALLER P=local-smtp S=sss
LOG: MAIN
  <= x@y U=CALLER P=local-smtp S=sss
LOG: delay_delivery MAIN
  no immediate delivery: more than 1 messages received in one connection
LOG: MAIN REJECT
  rejected MAIL command U=CALLER: too many messages in one connection
LOG: smtp_connection MAIN
  SMTP connection from CALLER closed by QUIT
LOG: smtp_connection MAIN
  SMTP connection from CALLER
LOG: MAIN REJECT
  rejected MAIL command U=CALLER: too many messages in one connection
LOG: smtp_connection MAIN
  SMTP connection from CALLER closed by QUIT