+max_received_linelength=$max_received_linelength
+recipients=$recipients
+TESTING_MACROS=$recipients
+(TESTING_MACROS)
+****
+exim -bs
+helo test
+mail from:<userz@test.ex>
+rcpt to:<userx@test.x>
+rcpt to:<usery@test.ex>
+data
+From: Himself <himself@there.tld>
+To: Yourself <you@here.tld>
+Subject: The subject is not the object
+
+This is the body of the message. Make the line much longer than any header.
+.
+quit
+****
+sudo exim -be -Mset $msg2
+from: $h_from:
+subject: $h_subject:
+message_body_size=$message_body_size
+message_id=$message_id
+message_exim_id=$message_exim_id
+max_received_linelength=$max_received_linelength
+recipients=$recipients
+****
+write test-data
+From: A Person <a.person@a.domain.tld>
+To: First <first@test.ex>, Second <second@test.ex>
+Subject: The subject is moot
+
+And now we have the body of the message,
+containing a small number of lines.
+****
+exim -bem DIR/test-data
+from: $h_from:
+to: $h_to:
+subject: $h_subject:
+message_body_size=$message_body_size
+message_exim_id=$message_exim_id
+message_linecount=$message_linecount
+message_body_linecount=$body_linecount
+max_received_linelength=$max_received_linelength
+headers -----------------
+$message_headers
+
+body --------------------
+$message_body
+
+body end ----------------
+$message_body_end
+****
+exim -bem DIR/test-data -t
+recipients=$recipients