Note also that headers cannot be
modified by any of the post-data ACLs (DATA, MIME and DKIM).
Headers may be modified by routers (subject to the above) and transports.
+.new
+The Received-By: header is generated as soon as the body reception starts,
+rather than the traditional time after the full message is received;
+this will affect the timestamp.
+.wen
All the usual ACLs are called; if one results in the message being
rejected, all effort spent in delivery (including the costs on
/* Cutthrough delivery:
We have to create the Received header now rather than at the end of reception,
so the timestamp behaviour is a change to the normal case.
-XXX Ensure this gets documented XXX.
Having created it, send the headers to the destination. */
if (cutthrough.fd >= 0 && cutthrough.delivery)