X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/7d50add39dc49d96962759c4376004cd2280ebe6..31c4e00570a5b70163c94c3886244954067988ba:/doc/doc-txt/NewStuff?ds=sidebyside diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff index 7a5bf4f15..6ef8f2855 100644 --- a/doc/doc-txt/NewStuff +++ b/doc/doc-txt/NewStuff @@ -1,4 +1,4 @@ -$Cambridge: exim/doc/doc-txt/NewStuff,v 1.47 2005/05/25 20:33:28 tom Exp $ +$Cambridge: exim/doc/doc-txt/NewStuff,v 1.54 2005/06/29 14:29:05 fanf2 Exp $ New Features in Exim -------------------- @@ -235,6 +235,14 @@ TF/04 There is a new ratelimit ACL condition which can be used to measure cdb {DB/ratelimits.cdb} \ {$value} {RATELIMIT} } + Warning: if you have a busy server with a lot of ratelimit tests, + especially with the per_rcpt option, you may suffer from a performance + bottleneck caused by locking on the ratelimit hints database. Apart from + making your ACLs less complicated, you can reduce the problem by using a + RAM disk for Exim's hints directory, /var/spool/exim/db/. However this + means that Exim will lose its hints data after a reboot (including retry + hints, the callout cache, and ratelimit data). + TK/01 Added an 'spf' lookup type that will return an SPF result for a given email address (the key) and an IP address (the database): @@ -247,6 +255,150 @@ TK/01 Added an 'spf' lookup type that will return an SPF result for a given Patch submitted by Chris Webb . +PH/02 There's a new verify callout option, "fullpostmaster", which first acts + as "postmaster" and checks the recipient . If that + fails, it tries just , without a domain, in accordance with + the specification in RFC 2821. + +PH/03 The action of the auto_thaw option has been changed. It no longer applies + to frozen bounce messages. + +TK/02 There are two new expansion items to help with the implementation of + the BATV "prvs" scheme in an Exim configuration: + + + ${prvs {
}{}{[KEYNUM]}} + + The "prvs" expansion item takes three arguments: A qualified RFC2821 + email address, a key and an (optional) key number. All arguments are + expanded before being used, so it is easily possible to lookup a key + and key number using the address as the lookup key. The key number is + optional and defaults to "0". The item will expand to a "prvs"-signed + email address, to be typically used with the "return_path" option on + a smtp transport. The decision if BATV should be used with a given + sender/recipient pair should be done on router level, to avoid having + to set "max_rcpt = 1" on the transport. + + + ${prvscheck {
}{}{}} + + The "prvscheck" expansion item takes three arguments. Argument 1 is + expanded first. When the expansion does not yield a SYNTACTICALLY + valid "prvs"-scheme address, the whole "prvscheck" item expands to + the empty string. If
is a "prvs"-encoded address after + expansion, two expansion variables are set up: + + $prvscheck_address Contains the "prvs"-decoded version of + the address from argument 1. + + $prvscheck_keynum Contains the key number extracted from + the "prvs"-address in argument 1. + + These two variables can be used in the expansion code of argument 2 + to retrieve the . The VALIDITY of the "prvs"-signed address + is then checked. The result is stored in yet another expansion + variable: + + $prvscheck_result Contains the result of a "prvscheck" + expansion: Unset (the empty string) for + failure, "1" for success. + + The "prvscheck" expansion expands to the empty string if
+ is not a SYNTACTICALLY valid "prvs"-scheme address. Otherwise, + argument 3 defines what "prvscheck" expands to: If argument 3 + is the empty string, "prvscheck" expands to the decoded version + of the address (no matter if it is CRYPTOGRAPHICALLY valid or not). + If argument 3 expands to a non-empty string, "prvscheck" expands + to that string. + + + Usage example + ------------- + + Macro: + + PRVSCHECK_SQL = ${lookup mysql{SELECT secret FROM batv_prvs WHERE \ + sender='${quote_mysql:$prvscheck_address}'}{$value}} + + RCPT ACL: + + # Bounces: drop unsigned addresses for BATV senders + deny message = This address does not send an unsigned reverse path. + senders = : + recipients = +batv_recipients + + # Bounces: In case of prvs-signed address, check signature. + deny message = Invalid reverse path signature. + senders = : + condition = ${prvscheck {$local_part@$domain}{PRVSCHECK_SQL}{1}} + !condition = $prvscheck_result + + Top-Level Router: + + batv_redirect: + driver = redirect + data = ${prvscheck {$local_part@$domain}{PRVSCHECK_SQL}{}} + + Transport (referenced by router that makes decision if + BATV is applicable): + + external_smtp_batv: + driver = smtp + return_path = ${prvs {$return_path} \ + {${lookup mysql{SELECT \ + secret FROM batv_prvs WHERE \ + sender='${quote_mysql:$sender_address}'} \ + {$value}fail}}} + +PH/04 There are two new options that control the retrying done by the daemon + at startup when it cannot immediately bind a socket (typically because + the socket is already in use). The default values reproduce what were + built-in constants previously: daemon_startup_retries defines the number + of retries after the first failure (default 9); daemon_startup_sleep + defines the length of time to wait between retries (default 30s). + +PH/05 There is now a new ${if condition called "match_ip". It is similar to + match_domain, etc. It must be followed by two argument strings. The first + (after expansion) must be an IP address or an empty string. The second + (after expansion) is a restricted host list that can match only an IP + address, not a host name. For example: + + ${if match_ip{$sender_host_address}{1.2.3.4:5.6.7.8}{...}{...}} + + The specific types of host list item that are permitted in the list are + shown below. Consult the manual section on host lists for further + details. + + . An IP address, optionally with a CIDR mask. + + . A single asterisk matches any IP address. + + . An empty item matches only if the IP address is empty. This could be + useful for testing for a locally submitted message or one from specific + hosts in a single test such as + + ${if match_ip{$sender_host_address}{:4.3.2.1:...}{...}{...}} + + where the first item in the list is the empty string. + + . The item @[] matches any of the local host's interface addresses. + + . Lookups are assumed to be "net-" style lookups, even if "net-" is not + specified. Thus, the following are equivalent: + + ${if match_ip{$sender_host_address}{lsearch;/some/file}... + ${if match_ip{$sender_host_address}{net-lsearch;/some/file}... + + You do need to specify the "net-" prefix if you want to specify a + specific address mask, for example, by using "net24-". + +PH/06 The "+all" debug selector used to set the flags for all possible output; + it is something that people tend to use semi-automatically when + generating debug output for me or for the list. However, by including + "+memory", an awful lot of output that is very rarely of interest was + generated. I have changed this so that "+all" no longer includes + "+memory". However, "-all" still turns everything off. + Version 4.51 ------------