-$Cambridge: exim/doc/doc-txt/NewStuff,v 1.135 2007/02/05 12:35:46 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/NewStuff,v 1.140 2007/02/07 12:23:35 ph10 Exp $
New Features in Exim
--------------------
time and date.
11. Exim has been modified so that it flushes SMTP output before implementing
- a delay in an ACL. This behaviour can be disabled by obeying control =
- no_delay_flush at some earlier point.
+ a delay in an ACL. It also flushes the output before performing a callout,
+ as this can take a substantial time. These behaviours can be disabled by
+ obeying control = no_delay_flush or control = no_callout_flush,
+ respectively, at some earlier stage of the connection. The effect of the
+ new default behaviour is to disable the PIPELINING optimization in these
+ situations, in order to avoid unexpected timeouts in clients.
+
+12. There are two new expansion conditions that iterate over a list. They are
+ called forany and forall, and they are used like this:
+
+ ${if forany{<a list>}{<a condition>}{<yes-string>}{<no-string>}}
+ ${if forall{<a list>}{<a condition>}{<yes-string>}{<no-string>}}
+
+ The first argument is expanded, and the result is treated as a list. By
+ default, the list separator is a colon, but it can be changed by the normal
+ method. The second argument is interpreted as a condition that is to be
+ applied to each item in the list in turn. During the interpretation of the
+ condition, the current list item is placed in a variable called $item.
+
+ - For forany, interpretation stops if the condition is true for any item,
+ and the yes-string is then expanded. If the condition is false for all
+ items in the list, the no-string is expanded.
+
+ - For forall, interpration stops if the condition is false for any item,
+ and the no-string is then expanded. If the condition is true for all
+ items in the list, the yes-string is expanded.
+
+ Note that negation of forany means that the condition must be false for all
+ items for the overall condition to succeed, and negation of forall means
+ that the condition must be false for at least one item.
+
+ In this example, the list separator is changed to a comma:
+
+ ${if forany{<, $recipients}{match{$item}{^user3@}}{yes}{no}}
+
+ Outside a forany/forall condition, the value of $item is an empty string.
+ Its value is saved and restored while forany/forall is being processed, to
+ enable these expansion items to be nested.
+
+13. There's a new global option called dsn_from that can be used to vary the
+ contents of From: lines in bounces and other automatically generated
+ messages ("delivery status notifications" - hence the name of the option).
+ The default setting is:
+
+ dsn_from = Mail Delivery System <Mailer-Daemon@$qualify_domain>
+
+ The value is expanded every time it is needed. If the expansion fails, a
+ panic is logged, and the default setting is used.
+
+14. The smtp transport has a new option called hosts_avoid_pipelining. It can
+ be used to suppress the use of PIPELINING to certain hosts, while still
+ supporting the other SMTP extensions (cf hosts_avoid_tls).
+
+15. By default, exigrep does case-insensitive matches. There is now a -I option
+ that makes it case-sensitive. This may give a performance improvement when
+ searching large log files. Without -I, the Perl pattern matches use the /i
+ option; with -I they don't. In both cases it is possible to change the case
+ sensitivity within the pattern using (?i) or (?-i).
Version 4.66
git://git.exim.org / users / heiko / exim.git / blobdiff