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Re: [ietf-smtp] Endless debate on IP literals

"John R Levine" <johnl@taugh.com> Wed, 01 January 2020 17:19 UTC

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Date: Wed, 01 Jan 2020 12:19:42 -0500
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From: John R Levine <johnl@taugh.com>
To: dcrocker@bbiw.net
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Subject: Re: [ietf-smtp] Endless debate on IP literals
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On Wed, 1 Jan 2020, Dave Crocker wrote:
> On 1/1/2020 8:11 AM, Dave Crocker wrote:
>> We need to be able to point to a detailed, technical specification for 
>> 'real MTA'.

It's somewhere between a profile and a BCP.  The profile would be of 5321 
or 5321bis, a set of commands and features it needs to support, e.g., 
EHLO with 8BITMIME and STARTTLS and PIPELINING.  The BCP is stuff like a 
fixed IP address with matching forward and reverse DNS that doesn't look 
generic, and that the MTA uses in its EHLO.

We obviously can't write down a set of rules and say if you do this 
everyone will accept your mail, but we can make it as likely as possible. 
I don't think we need to worry about large vs. small systems since 
everything I'm thinking of is easy to do on a $5/mo VPS or a Raspberry Pi 
in a school lab.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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