Re: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT

Mike Hillyer <mike@mikehillyer.com> Mon, 19 April 2021 12:36 UTC

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From: Mike Hillyer <mike@mikehillyer.com>
To: George Schlossnagle <george=40sparkpost.com@dmarc.ietf.org>, John Levine <johnl@taugh.com>
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Thread-Topic: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT
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Date: Mon, 19 Apr 2021 12:36:37 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf-smtp/q_65u9wwgD2popW0GsyMS8PKMEE>
Subject: Re: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT
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As someone who works with a lot of commercial mailers (and commercials MTAs), I have to agree. The whole commercial sending space is full of admins looking to do the right thing, they just want to know what the right thing is. Tell them what to do at the start of the session and they will follow it.

Mike

From: ietf-smtp <ietf-smtp-bounces@ietf.org> On Behalf Of George Schlossnagle
Sent: Sunday, April 18, 2021 7:47 PM
To: John Levine <johnl@taugh.com>
Cc: mrsam@courier-mta.com; ietf-smtp@ietf.org
Subject: Re: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT

As a commercial MTA and ESP provider, this proposal is very exciting to me.  Today we guess at these things and largely guess at things based off of either observed behavior or out-of-band discussion with those operating the receiver side of the email exchange.  Having this defined in the session would be great.

George

On Mon, 15 Mar 2021 at 19:47, John Levine <johnl@taugh.com<mailto:johnl@taugh.com>> wrote:
It appears that Sam Varshavchik  <mrsam@courier-mta.com<mailto:mrsam@courier-mta.com>> said:
>MXes which do not announce their limits are going to dominate for some time.
>So, I still need to do this for the foreseeable time. So, what does this
>SMTP extension buy me? The only thing I can think of: not duplicating
>messages when I don't need to.
>
>But the thing is: I don't recall anyone raising this to me, as a problem.
>This is not on my radar screen as a problem that wants to be solved.

I wouldn't think that your users would be very interested, but bulk mailers are desperate for
any hints about how much mail they can stuff at people without getting blocked or rate limited.

R's,
John

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--
GEORGE SCHLOSSNAGLE
chief evangelist
www.sparkpost.com<http://www.sparkpost.com>
(el) george@sparkpost.com<mailto:george@sparkpost.com>