X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/a320fabd09f43c02c869c90a5a5a70a49dd77f89..8acbb134096a6377737c435d43497dd79d17d081:/doc/doc-txt/experimental-spec.txt?ds=sidebyside diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt index f6529c6e2..bdab74841 100644 --- a/doc/doc-txt/experimental-spec.txt +++ b/doc/doc-txt/experimental-spec.txt @@ -821,7 +821,7 @@ The following variables are likely to be useful depending on the event type: An example might look like: -event_action = ${if = {msg:delivery}{$event_name} \ +event_action = ${if eq {msg:delivery}{$event_name} \ {${lookup pgsql {SELECT * FROM record_Delivery( \ '${quote_pgsql:$sender_address_domain}',\ '${quote_pgsql:${lc:$sender_address_local_part}}', \ @@ -1084,101 +1084,6 @@ QUIT 221 mail.example.net closing connection -DSN Support --------------------------------------------------------------- - -DSN Support tries to add RFC 3461 support to Exim. It adds support for -*) the additional parameters for MAIL FROM and RCPT TO -*) RFC complient MIME DSN messages for all of - success, failure and delay notifications -*) dsn_advertise_hosts main option to select which hosts are able - to use the extension -*) dsn_lasthop router switch to end DSN processing - -In case of failure reports this means that the last three parts, the message body -intro, size info and final text, of the defined template are ignored since there is no -logical place to put them in the MIME message. - -All the other changes are made without changing any defaults - -Building exim: --------------- - -Define -EXPERIMENTAL_DSN=YES -in your Local/Makefile. - -Configuration: --------------- -All DSNs are sent in MIME format if you built exim with EXPERIMENTAL_DSN=YES -No option needed to activate it, and no way to turn it off. - -Failure and delay DSNs are triggered as usual except a sender used NOTIFY=... -to prevent them. - -Support for Success DSNs is added and activated by NOTIFY=SUCCESS by clients. - -Add -dsn_advertise_hosts = * -or a more restrictive host_list to announce DSN in EHLO answers - -Those hosts can then use NOTIFY,ENVID,RET,ORCPT options. - -If a message is relayed to a DSN aware host without changing the envelope -recipient the options are passed along and no success DSN is generated. - -A redirect router will always trigger a success DSN if requested and the DSN -options are not passed any further. - -A success DSN always contains the recipient address as submitted by the -client as required by RFC. Rewritten addresses are never exposed. - -If you used DSN patch up to 1.3 before remove all "dsn_process" switches from -your routers since you don't need them anymore. There is no way to "gag" -success DSNs anymore. Announcing DSN means answering as requested. - -You can prevent Exim from passing DSN options along to other DSN aware hosts by defining -dsn_lasthop -in a router. Exim will then send the success DSN himself if requested as if -the next hop does not support DSN. -Adding it to a redirect router makes no difference. - - - - -Certificate name checking --------------------------------------------------------------- -The X509 certificates used for TLS are supposed be verified -that they are owned by the expected host. The coding of TLS -support to date has not made these checks. - -If built with EXPERIMENTAL_CERTNAMES defined, code is -included to do so for server certificates, and a new smtp transport option -"tls_verify_cert_hostnames" supported which takes a hostlist -which must match the target host for the additional checks must be made. -The option currently defaults to empty, but this may change in -the future. "*" is probably a suitable value. -Whether certificate verification is done at all, and the result of -it failing, is stll under the control of "tls_verify_hosts" nad -"tls_try_verify_hosts". - -The name being checked is that for the host, generally -the result of an MX lookup. - -Both Subject and Subject-Alternate-Name certificate fields -are supported, as are wildcard certificates (limited to -a single wildcard being the initial component of a 3-or-more -component FQDN). - -The equivalent check on the server for client certificates is not -implemented. At least one major email provider is using a client -certificate which fails this check. They do not retry either without -hte client certificate or in clear. - -It is possible to duplicate the effect of this checking by -creative use of Events. - - DANE @@ -1302,12 +1207,13 @@ MX, A and TLSA records. A TLSA lookup will be done if either of the above options match and the host-lookup succeded using dnssec. -If the TLSA lookup succeeds, a TLS connection will be required -for the host. +If a TLSA lookup is done and succeeds, a DANE-verified TLS connection +will be required for the host. (TODO: specify when fallback happens vs. when the host is not used) -If dane is in use the following transport options are ignored: +If DANE is requested and useable (see above) the following transport +options are ignored: hosts_require_tls tls_verify_hosts tls_try_verify_hosts @@ -1315,6 +1221,10 @@ If dane is in use the following transport options are ignored: tls_crl tls_verify_cert_hostnames +If DANE is not usable, whether requested or not, and CA-anchored +verification evaluation is wanted, the above variables should be set +appropriately. + Currently dnssec_request_domains must be active (need to think about that) and dnssec_require_domains is ignored.