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Re: [apps-discuss] draft-santos-smtpgrey-02: SMTP Service Extension for Greylisting Operations

Hector Santos <hsantos@isdg.net> Sat, 01 February 2014 18:39 UTC

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Date: Sat, 01 Feb 2014 13:39:07 -0500
From: Hector Santos <hsantos@isdg.net>
Organization: Santronics Software, Inc.
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To: "Murray S. Kucherawy" <superuser@gmail.com>
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Cc: IETF Apps Discuss <apps-discuss@ietf.org>
Subject: Re: [apps-discuss] draft-santos-smtpgrey-02: SMTP Service Extension for Greylisting Operations
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On 2/1/2014 1:03 PM, Murray S. Kucherawy wrote:
> On Sat, Feb 1, 2014 at 9:52 AM, Hector Santos <hsantos@isdg.net
> <mailto:hsantos@isdg.net>> wrote:
>
>     I am wondering if it worth further pursuing this 2012 draft
>     SMTPGREY SMTP extension proposal.
>     [...]
>
>
> Do you have any implementation or interoperability data you can provide?


For our own implementation and deployments of WCSMTP.

No collections from other packages was made from a client standpoint.

Many Greylisting servers do issue a time hint in their 45x greylisting 
responses in various forms.   We can only speculate if other clients 
are parsing this non-standard information and leveraging it for their 
outbound mail retry scheduling logic.  Our client parses for the 
common format seen out there, including the proposed format.

The criteria for proof of concept would be a reduction of retries to a 
minimum of one try with the minimum amount of delivery delay.  I can 
show that proof of concept with our logs of this occurring.  For 
servers that issues a time hint, we have this minimum set.  For 
others, there are redundant retries and longer delivery times.


-- 
HLS

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