https://datatracker.ietf.org/doc/rfc8996/

   This document formally deprecates Transport Layer Security (TLS)
   versions 1.0 (RFC 2246) and 1.1 (RFC 4346).  Accordingly, those
   documents have been moved to Historic status.  These versions lack
   support for current and recommended cryptographic algorithms and
   mechanisms, and various government and industry profiles of
   applications using TLS now mandate avoiding these old TLS versions.
   TLS version 1.2 became the recommended version for IETF protocols in
   2008 (subsequently being obsoleted by TLS version 1.3 in 2018),
   providing sufficient time to transition away from older versions.
   **Removing support for older versions from implementations reduces the
   attack surface, reduces opportunity for misconfiguration, and
   streamlines library and product maintenance.**

On 5/21/24 00:33, Benny Pedersen via mailop wrote:
Brotman, Alex via mailop skrev den 2024-05-20 15:09:
Hey folks,

Over the next few weeks, we're going to be disabling TLSv1/v1.1 inbound to our 
platform.  Most senders are already using TLSv1.2/v1.3, so I don't think this 
will be an issue.  However, keep in mind that if you're not already using those 
newer versions, you'll now revert to clear-text. Around the same time, we'll 
also begin negatively impacting reputation for clear-text senders (those 
without TLSv1.2/v1.3).  It won't be a huge impact, but many senders are 
extremely cautious in these areas.  If you have questions, please let me know.

i say disabling tls versions is plain stupid to make plain text a bigger 
problem, simply don't make that kind of security

if comcast.net have found a bug in openssl, please make a ticket for this, so 
it will be fixed in openssl

i don't like your wording on "hey something"


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