Re: [mailop] What a drag it is sending DMARC reports

Wed, 05 Jan 2022 11:01:04 -0800 

On Wed 05/Jan/2022 00:32:57 +0100 Brandon Long wrote:
I didn't see anyone address the original problem here much, so here are some details about this. 


Thanks!
There is the dmarc address that Google itself uses, dmarc-nore...@google.com <mailto:dmarc-nore...@google.com>, it sometimes has the same rejections.  I haven't checked recently, but wouldn't surprise me.  Indeed, the problem occurs at midnight in the most popular time zones, more in the various US ones than in Europe. Jittering your sends to not be on the hour is a good idea for everyone sending dmarc reports.
Actually there is a random sleep at the beginning. The short time it delays should be enough to avoid hardware problems, especially at major computer centers.
For non-Google dmarc report addresses hosted at Gmail/Workspace, it would be wise for the owners of those accounts to see the limits: https://support.google.com/a/answer/1366776?hl=en&ref_topic=28609 the main one being that Gmail accounts only accept about 1 message/second because they are not designed to be dumping grounds for automated mail.  An internal FAQ stated that email is not a logging service, and it's a very poor alerting destination as well.
Hmm... automated mail exists, and SMTP transport for logging and alerting is widely used. That internal FAQ must obviously be talking about Gmail accounts, not email services in general. I'm not clear what is the market strategy that led to those limitations, but my feeling is that Google should explain it more loudly, because people seem to choose Gmail as a robust general-purpose email hub. 



The limits are implemented with allowances for bursts, and the
distributed nature of the system means the limits are not perfectly
enforced.  It also has the classic problems of trying to impose a
limit on a multi-hop system, so the name of the game is flow
control... but that does lead to blocking messages that we could
queue internally and deliver later.
Not perfectly indeed. Mailinblue seems to work as one of those third party services for analyzing dmarc reports. On that December day I had just two domains to report at their address; if they have hundreds of domains receiving a dozen reports each, that would still be below 3600 messages in an hour. And, in addition to the random sleep, I delay reporting by an hour (to account for DST). The log quoted below shows attempts at 0142, 0147, 0152, 0222, 0227 and 0232 (UCT) for a final 550. 



It also pushes back on the servers sending to the accounts... which
sometimes is problematic (some servers will delay the entire queue
to the domain or domains at the IP) but has other benefits as
well... not to mention, less chances of bouncing, since I'm sure
anyone sending us 20qps of mail wouldn't really want us to send
them 20qps of bounces delayed by 3 days.
That sounds like some kind of greylisting... If delaying the entire queue is a problem, the purpose must be to delay must be aimed at specific mailboxes. By the time they've been selected, their deliverability should have been sorted out as well, no? 



[...]
For anyone who cares about their dmarc reports, I'd highly recommend using a third party service for analyzing them, they will be better set up to handle the load. 


   ... if they're not hosted at Gmail.


Best
Ale
--

[...]

On Fri, Dec 17, 2021 at 4:33 AM Alessandro Vesely via mailop wrote:

[...]



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    id=00000000005DC1BC.0000000061BBEB1E.000029B4,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550-5.2.1 The user you are trying
    to contact is receiving mail at a rate that
    Dec 17 03:22:55 courieresmtp:
    id=00000000005DC1BC.0000000061BBEB1E.000029B4,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550-5.2.1 prevents additional
    messages from being delivered. For more
    Dec 17 03:22:55 courieresmtp:
    id=00000000005DC1BC.0000000061BBEB1E.000029B4,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550-5.2.1 information, please visit
    Dec 17 03:22:55 courieresmtp:
    id=00000000005DC1BC.0000000061BBEB1E.000029B4,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550 5.2.1
    https://support.google.com/mail/?p=ReceivingRatePerm
    <https://support.google.com/mail/?p=ReceivingRatePerm>
    e26si4954720edr.306 - gsmtp
    Dec 17 03:22:55 courieresmtp:
    id=00000000005DC1BC.0000000061BBEB1E.000029B4,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>,status: failure
    Dec 17 03:27:52 courierd:
    
started,id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,module=esmtp,host=mailinblue.com
    <http://mailinblue.com>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>
    Dec 17 03:27:53 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 450-4.2.1 The user you are trying
    to contact is receiving mail at a rate that
    Dec 17 03:27:53 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 450-4.2.1 prevents additional
    messages from being delivered. Please resend your
    Dec 17 03:27:53 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 450-4.2.1 message at a later time.
    If the user is able to receive mail at that
    Dec 17 03:27:53 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 450-4.2.1 time, your message will
    be delivered. For more information, please
    Dec 17 03:27:53 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 450-4.2.1 visit
    Dec 17 03:27:53 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 450 4.2.1
    https://support.google.com/mail/?p=ReceivingRate
    <https://support.google.com/mail/?p=ReceivingRate>
    ho31si2752830ejc.5 - gsmtp
    Dec 17 03:27:53 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>,status: deferred
    Dec 17 03:32:53 courierd:
    
started,id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,module=esmtp,host=mailinblue.com
    <http://mailinblue.com>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>
    Dec 17 03:32:54 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550-5.2.1 The user you are trying
    to contact is receiving mail at a rate that
    Dec 17 03:32:54 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550-5.2.1 prevents additional
    messages from being delivered. For more
    Dec 17 03:32:54 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550-5.2.1 information, please visit
    Dec 17 03:32:54 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>: 550 5.2.1
    https://support.google.com/mail/?p=ReceivingRatePerm
    <https://support.google.com/mail/?p=ReceivingRatePerm>
    q17si4029627eds.411 - gsmtp
    Dec 17 03:32:54 courieresmtp:
    id=00000000005DC1B9.0000000061BBEB1A.00002839,from=<dmarc-bou...@tana.it
    <mailto:dmarc-bou...@tana.it>>,addr=<dm...@mailinblue.com
    <mailto:dm...@mailinblue.com>>,status: failure



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