Clarify interaction of delay_warning and retry configuration.

[users/heiko/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 8d103fa83b82ad13cfd0f9ac71509341dff5d0e1..17bdcc943a6b3a2bc3a668a5a5fc8971a7a2efe4 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -371,11 +371,13 @@ contributors.
 .section "Exim documentation" "SECID1"
 . Keep this example change bar when updating the documentation!
 
+.new
 .cindex "documentation"
 This edition of the Exim specification applies to version &version() of Exim.
 Substantive changes from the &previousversion; edition are marked in some
 renditions of the document; this paragraph is so marked if the rendition is
 capable of showing a change indicator.
+.wen
 
 This document is very much a reference manual; it is not a tutorial. The reader
 is expected to have some familiarity with the SMTP mail transfer protocol and
@@ -7038,6 +7040,18 @@ With sufficiently modern LDAP libraries, Exim supports forcing TLS over regular
 LDAP connections, rather than the SSL-on-connect &`ldaps`&.
 See the &%ldap_start_tls%& option.
 
+.new
+Starting with Exim 4.83, the initialization of LDAP with TLS is more tightly
+controlled. Every part of the TLS configuration can be configured by settings in
+&_exim.conf_&. Depending on the version of the client libraries installed on
+your system, some of the initialization may have required setting options in
+&_/etc/ldap.conf_& or &_~/.ldaprc_& to get TLS working with self-signed
+certificates. This revealed a nuance where the current UID that exim was
+running as could affect which config files it read. With Exim 4.83, these
+methods become optional, only taking effect if not specifically set in
+&_exim.conf_&.
+.wen
+
 
 .section "LDAP quoting" "SECID68"
 .cindex "LDAP" "quoting"
@@ -13638,6 +13652,9 @@ a very large time at the end of the list. For example:
 .code
 delay_warning = 2h:12h:99d
 .endd
+Note that the option is only evaluated at the time a delivery attempt fails,
+which depends on retry and queue-runner configuration.
+Typically retries will be configured more frequently than warning messages.
 
 .option delay_warning_condition main string&!! "see below"
 .vindex "&$domain$&"
@@ -26055,6 +26072,12 @@ validation to succeed, of course, but if it's not preinstalled, sending the
 root certificate along with the rest makes it available for the user to
 install if the receiving end is a client MUA that can interact with a user.
 
+Note that certificates using MD5 are unlikely to work on today's Internet;
+even if your libraries allow loading them for use in Exim when acting as a
+server, increasingly clients will not accept such certificates.  The error
+diagnostics in such a case can be frustratingly vague.
+
+
 
 .section "Self-signed certificates" "SECID187"
 .cindex "certificate" "self-signed"