+# sock_proxy option set but expands to empty string
+server PORT_S
+220 Connected OK
+EHLO
+250-server id
+250
+MAIL FROM
+250
+RCPT TO
+250
+DATA
+354 hit me
+.
+250 accepted OK
+QUIT
+250 bye
+****
+#
+exim -odi -bs -DFALLBACK=yes
+ehlo test.ex
+mail from:<>
+rcpt to:<userx@test.ex>
+data
+Date: Fri, 17 Dec 2004 14:35:01 +0100
+Subject: message should be sent
+
+direct, not via proxy
+.
+quit
+****