X-Git-Url: https://git.exim.org/users/heiko/exim.git/blobdiff_plain/09c17790eec23907b93df1ec7cee746b28dfc836..aa2a70baf1a7ae2d6c579094a188c1d30d3d5fd5:/doc/doc-txt/experimental-spec.txt diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt index 266e19891..d57cbf903 100644 --- a/doc/doc-txt/experimental-spec.txt +++ b/doc/doc-txt/experimental-spec.txt @@ -1154,14 +1154,17 @@ 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 list of -names for which the additional checks must be made. +"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 @@ -1170,7 +1173,7 @@ 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. +the client certificate or in clear. It is possible to duplicate the effect of this checking by creative use of Events.