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--- doc/spec.txt.orig	Wed Dec 19 13:50:32 2001
+++ doc/spec.txt	Tue Jan 15 15:52:05 2002
@@ -14403,6 +14403,19 @@
 be adequate for all your requirements if you are mainly interested in
 encrypting transfers, and not in secure identification.
 
+However, many clients require that the certificate presented by Exim be a user
+(also called "leaf" or "site") certificate, and not a self-signed certificate.
+In this case, the self-signed certificate described above must be installed on
+the client host as a trusted root certification authority and the certificate
+used by Exim must be a user certificate signed with that self-signed
+certificate.
+
+For information on creating self-signed CA certificates and using them to sign
+user certificates, see the "General implementation overview" chapter of the
+Open-source PKI Book, available online at:
+
+     http://ospkibook.sourceforge.net/
+
 
 
                   39. CUSTOMIZING ERROR AND WARNING MESSAGES