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

Mike Hillyer <mike@mikehillyer.com> Tue, 20 April 2021 12:24 UTC

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From: Mike Hillyer <mike@mikehillyer.com>
To: Ned Freed <ned.freed@mrochek.com>, John R Levine <johnl@taugh.com>
CC: "ietf-smtp@ietf.org" <ietf-smtp@ietf.org>
Thread-Topic: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT
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Date: Tue, 20 Apr 2021 12:24:00 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf-smtp/N44NOIn-F0xqLvGmrqFigBeXYL4>
Subject: Re: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT
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Generally speaking when I advise senders on their rate limits, I have them use the smallest denominator possible, because most commercial MTAs will take a per-hour rate limit and implement it as "send the hour's allotment in a single burst and then wait 59 minutes", which I don't think most receivers want, so I advise setting a per second limit when possible. One message per second is better than 3600 messages per hour if it means a 3600 message burst and then a long wait.

Mike

-----Original Message-----
From: ietf-smtp <ietf-smtp-bounces@ietf.org> On Behalf Of Ned Freed
Sent: Monday, April 19, 2021 7:34 PM
To: John R Levine <johnl@taugh.com>
Cc: Ned Freed <ned.freed@mrochek.com>; ietf-smtp@ietf.org
Subject: Re: [ietf-smtp] [Emailcore] Proposed ESMTP keyword RCPTLIMIT

> On Mon, 19 Apr 2021, 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. ...

> A little surveying might be in order.

> I see that Postfix lets you set both the numerator and denominator of 
> the rate limit, but the denominator defaults to a minute.  It has 
> separate rate limits for connections and messages.

> Exim also lets you set both, the examples use an hour.  The 
> documentation says that if you use a large interval that lets people send bursts.

Sounds familiar. Oracle Messaging Server lets you set both; the denominator default is one hour. 

We store the limits in memcache or Redis so they can apply across mutiple MTAs.
The usual limit is per-IP, but we support per-host and per-domain as well.

The demoninator in PowerMTA is a string rather than a number, possible values are sec, s, min, m, hr, or h. It supports per-IP and per-host and probably other stuff; my familiarity here is limited.

I assume the Exim and Postfix limits are per-host, which in most cases translates to per-IP.

I have to say there's more consistency here than I expected.

				Ned

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