**** SMTP testing: that is not a real message id!
+221 myhost.test.ex closing connection\r
+### proxy timeout
+
+**** SMTP testing session as if from host ip4.ip4.ip4.ip4
+**** but without any ident (RFC 1413) callback.
+**** This is not for real!
+
+220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000\r
+503 Command refused, required Proxy negotiation failed\r
221 myhost.test.ex closing connection\r
******** SERVER ********
### non-prox plain receive
### protocol v1 receive
### protocol v2 receive
+### proxy timeout