+PH/14 In the default configuration, change the use of "message" in ACL warn
+ statements to "add_header".
+
+PH/15 Diagnose a filter syntax error for "seen", "unseen", or "noerror" if not
+ not followed by a command (e.g. "seen endif").
+
+PH/16 Recognize SMTP codes at the start of "message" in ACLs and after :fail:
+ and :defer: in a redirect router. Add forbid_smtp_code to suppress the
+ latter.
+
+PH/17 Added extra conditions to the default value of delay_warning_condition
+ so that it is now:
+
+ ${if or { \
+ { !eq{$h_list-id:$h_list-post:$h_list-subscribe:}{} } \
+ { match{$h_precedence:}{(?i)bulk|list|junk} } \
+ { match{$h_auto-submitted:}{(?i)auto-generated|auto-replied} } \
+ }{no}{yes}}
+
+ The Auto-Submitted: and various List- headers are standardised, whereas I
+ don't think Precedence: ever was.
+
+PH/18 Refactored debugging code in route_finduser() to show more information,
+ in particular, the error code if getpwnam() issues one.
+
+PH/19 Added PQsetClientEncoding(conn, "SQL_ASCII") to the pgsql code module.
+ This is apparently needed in addition to the PH/07 change above to avoid
+ any possible encoding problems.
+
+PH/20 Perl can change the locale. Exim was resetting it after a ${perl call,
+ but not after initializing Perl.
+
+PH/21 Added a call to PQsetNoticeProcessor() to catch pgsql "notices" and
+ output them only if debugging. By default they are written stderr,
+ apparently, which is not desirable.
+
+PH/22 Added Alain Williams' LDAP patch to support setting REFERRALS=off on
+ queries.
+
+JJ/01 exipick: added --reverse (and -R synonym), --random, --size, --sort and
+ --not options
+
+JJ/02 exipick: rewrote --help documentation to hopefully make more clear.
+
+PH/23 Made -oMaa and -oMt work with -bh and -bs to pretend the connection is
+ authenticated or an ident call has been made. Suppress the default
+ values for $authenticated_id and $authenticated_sender (but permit -oMai
+ and -oMas) when testing with -bh.
+
+PH/24 Re-jigged the order of the tests in the default configuration so that the
+ tests for valid domains and recipients precede the DNS black list and CSA
+ tests, on the grounds that those ones are more expensive.
+
+PH/25 Exim was not testing for a space following SMTP commands such as EHLO
+ that require one. Thus, EHLORHUBARB was interpreted as a valid command.
+ This bug exists in every version of Exim that I still have, right back to
+ 0.12.
+
+PH/26 (n)wildlsearch lookups are documented as being done case-insensitively.
+ However, an attempt to turn on case-sensitivity in a regex key by
+ including (?-i) didn't work because the subject string was already
+ lowercased, and the effects were non-intuitive. It turns out that a
+ one-line patch can be used to allow (?-i) to work as expected.
+