-# -bS to several local deliveries
+# -bS to several local deliveries and $message_headers[_raw]
exim -bS -odi
mail from:someone@some.where
rcpt to:blackhole@HOSTNAME
DATA
From:<someone@some.where>
To: Recipients not given:;
+X-Test: (=?iso-8859-8?b?7eXs+SDv4SDp7Oj08A==?=)
Yet more text.
.