[ietf-smtp] SMTP Reply code 1yz Positive Preliminary reply
Hector Santos <hsantos@isdg.net> Thu, 05 March 2020 17:56 UTC
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Message-ID: <5E613D31.70301@isdg.net>
Date: Thu, 05 Mar 2020 12:56:01 -0500
From: Hector Santos <hsantos@isdg.net>
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CC: John C Klensin <john-ietf@jck.com>
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Subject: [ietf-smtp] SMTP Reply code 1yz Positive Preliminary reply
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On 3/5/2020 11:28 AM, Hector Santos wrote: > I used the reply group: > > 1yz Positive Preliminary reply > I had forgotten that RFC5321 had removed this 1yz code. https://tools.ietf.org/html/rfc5321#section-4.2.1 All because of the 1yz potentially used as a "preliminary" multiple lines "1yz-" response before the final response was issued and a possible legacy 821 client that looked only at the first response line because it didn't expect multiple lines. I don't fully recall the discussions. While I would had accepted the decision for backward compatibility reasons over a decade ago, I am pretty sure I would of been somewhat disappointed by the removal of "1yz Positive preliminary reply" codes, removing even the possibility of a keep alive concept. Today speeds allow for fast data processing, so even today, 5, certainly 10 minutes of idle timeout is outdated and probably should be a design taboo today. If we don't want ESMTP 2821 clients to use 1yz, well, maybe for RFC5321bis, we can lower the timeouts. I already do for after a successful transactions where there is additional 5 minutes wait for a new transaction. I reduced to less than 1 minute to because clients from the BIG boys were 99.9% of the time holding up my servers and never doing a 2nd MAIL transaction. So wcSMTP will drop clients who chews up available mail service time from the server threads. -- HLS
- [ietf-smtp] SMTP Reply code 500 Geethapriya Liyanage
- Re: [ietf-smtp] SMTP Reply code 500 Alessandro Vesely
- Re: [ietf-smtp] SMTP Reply code 500 Paul Smith
- Re: [ietf-smtp] SMTP Reply code 500 John C Klensin
- Re: [ietf-smtp] SMTP Reply code 500 Geethapriya Liyanage
- Re: [ietf-smtp] SMTP Reply code 500 Geethapriya Liyanage
- Re: [ietf-smtp] SMTP Reply code 500 Paul Smith
- Re: [ietf-smtp] SMTP Reply code 500 Hector Santos
- [ietf-smtp] SMTP Reply code 1yz Positive Prelimin… Hector Santos
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… John C Klensin
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… Hector Santos
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… Hector Santos
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… Paul Smith
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… Hector Santos
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… John C Klensin
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… Hector Santos
- Re: [ietf-smtp] SMTP Reply code 1yz Positive Prel… John C Klensin