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Re: [ietf-smtp] [Proposal] confusing parts of the mail system, was 250-MARKDOWN

2019-01-10 13:56:16
On Thu, Jan 10, 2019 at 11:48 AM John R Levine <johnl(_at_)taugh(_dot_)com> 

On Thu, 10 Jan 2019, John Bucy wrote:
Question is, is BINARYMIME doable?  Or a lost cause?

As I see it, the problem is a message getting stuck "in the middle" where
the next hop doesn't support the extension e.g. user has a .forward file.

For systems that have separate MUA and MTA, the MUA has no way to tell
whether a downstream recipient will support BINARYMIME

The MSA could call ahead/cut-through, doesn't exim do that? That might also
allow for the mua to throw an error ui at the user if they fat-fingered the
recipient rather than getting a bounce back later.

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