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Re: [ietf-smtp] Possible cont4ibution to moving forward with RFC5321bis SMTP

2019-12-26 16:03:53
On 12/26/19 4:30 PM, John C Klensin wrote:

I also interpret some recent work and statements
within the IETF as leading toward prohibiting email that is not
encrypted hop-by-hop on the grounds of privacy protection not
anti-spam efforts.

As sympathetic as I am to the privacy issue, I'd have a difficult time supporting a general requirement to encrypt all mail relaying because of backward compatibility issues with hosts that don't have TLS support yet (including IIoT-related concerns).

I also think that any SMTP upgrade will quite naturally have a long tail, so imposing any global requirement (even if it earned broad support) without breaking mail that people need to continue to have delivered, would be quite a technical challenge.

To me it seems that all of this should be out-of-scope for 5321bis, or that the only mention of this in 5321bis should be to declare such things out-of-scope.   Requiring hop-by-hop encryption would be the most disruptive change in the history of SMTP, I think, far more so than EHLO.


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