From: Jeremy Harris Date: Sun, 29 Jul 2018 14:27:03 +0000 (+0100) Subject: REQUIRETLS: amplify docs discussion X-Git-Tag: exim-4.92-RC1~141 X-Git-Url: https://git.exim.org/exim.git/commitdiff_plain/f9d4bb1a2ae19edfcde680bebfeb8712e6f2a42a REQUIRETLS: amplify docs discussion --- diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt index 43f14237b..1bc5d0275 100644 --- a/doc/doc-txt/experimental-spec.txt +++ b/doc/doc-txt/experimental-spec.txt @@ -881,12 +881,15 @@ The Exim implementation includes Differences from spec: - we support upgrading the requirement for REQUIRETLS, including adding - it from cold, withing an MTA. The spec only define the sourcing MUA + it from cold, within an MTA. The spec only define the sourcing MUA as being able to source the requirement, and makes no mention of upgrade. - No support is coded for the RequireTLS header (which can be used - to annul DANE and/or STS policiy). [can this be done in ACL?] + to annul DANE and/or STS policiy). [this can _almost_ be done in + transport option expansions, but not quite: it requires tha DANE-present + but STARTTLS-failing targets fallback to cleartext, which current DANE + coding specifically blocks] -Note that REQUIRETLS is only advertised once a TLS connection is acheived +Note that REQUIRETLS is only advertised once a TLS connection is achieved (in contrast to STARTTLS). If you want to check the advertising, do something like "swaks -s 127.0.0.1 -tls -q HELO".