Re: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT
Michael Peddemors <michael@linuxmagic.com> Mon, 19 April 2021 22:01 UTC
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From: Michael Peddemors <michael@linuxmagic.com>
Organization: LinuxMagic Inc.
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Date: Mon, 19 Apr 2021 15:01:41 -0700
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Subject: Re: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT
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On 2021-04-19 2:18 p.m., Ned Freed wrote: > I'm especially interested in people's thoughts on rate limits. The problem I > have with rate limits is, well, how to express them. For example, a rate limit > of 10 transactions a minute is not the same as 600 transactions an hour: In the > former case it's unlikely that a sender will be allowed to bang out 600 messages > in a minute followed by 59 minutes of silence, whereas the latter allows that. The question is, in many cases the rate limits will change during the course of the SMTP connection.. And we may not have enough information to declare a rate limit, and declaring a rate limit that isn't accurate means it isn't smart to advertise a limit that is not guaranteed. That rate limit may change on many variables that occur during the SMTP connection.. And because of this, many MTA's will not be able to advertise one correctly, I know that in our MTA's that will be the case, and of course we expect that any sender properly handles any form of instruction to stop sending, whether any pre-advertised limit is in place or not. Given that, (MTA's ability to respond to a 'stop sending' (4xx or 5xx)) we will continue using dynamic rate limits, rather than preset limits, instead of implementing two mechanisms. I am sure others out there with advanced SMTP architectures are facing the same concerns. -- "Catch the Magic of Linux..." ------------------------------------------------------------------------ Michael Peddemors, President/CEO LinuxMagic Inc. Visit us at http://www.linuxmagic.com @linuxmagic A Wizard IT Company - For More Info http://www.wizard.ca "LinuxMagic" a Registered TradeMark of Wizard Tower TechnoServices Ltd. ------------------------------------------------------------------------ 604-682-0300 Beautiful British Columbia, Canada This email and any electronic data contained are confidential and intended solely for the use of the individual or entity to which they are addressed. Please note that any views or opinions presented in this email are solely those of the author and are not intended to represent those of the company.
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Dave Crocker
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Viktor Dukhovni
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Dave Crocker
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Viktor Dukhovni
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John Levine
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John C Klensin
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Rolf E. Sonneveld
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Sam Varshavchik
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John Levine
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John C Klensin
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Claus Assmann
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Alessandro Vesely
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Jeremy Harris
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… John C Klensin
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Sam Varshavchik
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Keith Moore
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Viktor Dukhovni
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Valdis Kl ē tnieks
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Valdis Kl ē tnieks
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… John C Klensin
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Alessandro Vesely
- Re: [ietf-smtp] parsing SMTP replies Keith Moore
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… John C Klensin
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John C Klensin
- Re: [ietf-smtp] parsing SMTP replies Michael Peddemors
- Re: [ietf-smtp] parsing SMTP replies Ned Freed
- Re: [ietf-smtp] parsing SMTP replies Viktor Dukhovni
- Re: [ietf-smtp] parsing SMTP replies Michael Peddemors
- Re: [ietf-smtp] parsing SMTP replies Jeremy Harris
- Re: [ietf-smtp] parsing SMTP replies Laura Atkins
- Re: [ietf-smtp] parsing SMTP replies George Schlossnagle
- Re: [ietf-smtp] parsing SMTP replies Ned Freed
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Ned Freed
- Re: [ietf-smtp] parsing SMTP replies (was: Propos… Ned Freed
- Re: [ietf-smtp] parsing SMTP replies Richard Clayton
- Re: [ietf-smtp] parsing SMTP replies Hector Santos
- Re: [ietf-smtp] parsing SMTP replies Laura Atkins
- Re: [ietf-smtp] parsing SMTP replies Ned Freed
- Re: [ietf-smtp] parsing SMTP replies John C Klensin
- Re: [ietf-smtp] parsing SMTP replies Hector Santos
- Re: [ietf-smtp] parsing SMTP replies Hector Santos
- Re: [ietf-smtp] parsing SMTP replies Laura Atkins
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John Levine
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Jeremy Harris
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John Levine
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… George Schlossnagle
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Hector Santos
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Mike Hillyer
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John R Levine
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Michael Peddemors
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Jeremy Harris
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… George Schlossnagle
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Sam Varshavchik
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Laura Atkins
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Arnt Gulbrandsen
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Mike Hillyer
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Dave Crocker
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Richard Clayton
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Laura Atkins
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… John R Levine
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Richard Clayton
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Ned Freed
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Tony Finch
- Re: [ietf-smtp] [Emailcore] Proposed ESMTP keywor… Viktor Dukhovni