userx@test.ex
  router = r3, transport = t1

**** SMTP testing session as if from host 127.0.0.1
**** 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
250 myhost.test.ex Hello test [127.0.0.1]
250 OK
451 Temporary local problem - please try later
221 myhost.test.ex closing connection