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

valdis.kletnieks@vt.edu Thu, 10 January 2019 20:07 UTC

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To: John Bucy <jbucy=40google.com@dmarc.ietf.org>
cc: John R Levine <johnl@taugh.com>, ietf-smtp <ietf-smtp@ietf.org>
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Date: Thu, 10 Jan 2019 15:07:44 -0500
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Subject: Re: [ietf-smtp] [Proposal] confusing parts of the mail system, was 250-MARKDOWN
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On Thu, 10 Jan 2019 11:55:53 -0800, John Bucy said:

> 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.

No.

Consider this reply.  I'm in Comcast cable territory, which means that I can
only do outbound port 25 to Comcast/Xfinity servers.  So my only realistic
way to get this mail out is to 587 it to Google's submission servers.

Now how do I "call ahead" for the cc: that's going to John Levine? There's
no way for me to contact mx1.taugh.com and ask "Hey, I'm about to hand
an email to Google, do you support BINARYMIME?" 

And if I *did* make that connection, why should I not just *send the message*?

Hint: Find out what "direct to MX spam" is, and why Comcast blocks outbound
port 25.

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