It's WooCommerce:
https://github.com/woocommerce/woocommerce/blob/ab1a35719c8719c0065f6053892ca970f7f01deb/plugins/woocommerce/includes/emails/class-wc-email-customer-new-account.php#L83

On Thu, May 26, 2022 at 5:08 PM Ken Simpson <ksimp...@mailchannels.com>
wrote:

> Hi Jarland,
>
> Yes, we see this as well - since this morning Pacific Time. They are
> snow-shoeing too, sending just one or two submissions per web form,
> presumably to keep a low profile. Same pattern of recipients as you are
> seeing.
>
> I'm trying to track down the victim software, which seems to be a
> WordPress plugin.
>
> Regards,
> Ken
>
> On Thu, May 26, 2022 at 4:15 PM Jarland Donnell via mailop <
> mailop@mailop.org> wrote:
>
>> Over the last week or so I've noticed an exceptional increase in
>> outbound emails from my customers to invalid recipients. Obviously this
>> is problematic but understandable. All of the customers in question run
>> websites that send an email to confirm registration, and all of the
>> recipients are properly formatted email addresses. They just don't
>> exist, and they're increasing at an unusual rate. Others may have the
>> same going on but may not yet be aware of the pattern. My hope is that
>> by sharing the pattern others might begin to fight against it as well.
>>
>> Here is a look at some censored logs: https://clbin.com/Gxeoo
>>
>> Notice the trend being username + 4 digits, primarily at free email
>> providers and regional ISPs. Examples:
>>
>> heidireynoldsplad2...@gmail.com
>> susanpowersvgjfae2...@cox.net
>> pabloharveyfhi6...@rediffmail.com
>> florencenashhqjqj8...@orange.fr
>> carlosfranklinlydy2...@comcast.net
>>
>> It's really off the charts, and it's impacting a wide variety of
>> customers who have no relation to each other. The only similarity being
>> that they send out website registration confirmations in all cases.
>>
>> Of course, my first theory is forum spam / blog comment spam. Even if
>> they can't accomplish the spam, they have most likely built complete
>> automation to handle this process of mass registrations for a wonderful
>> "spray and pray" technique. Since the email accounts don't exist,
>> they're most likely hoping that a confirmation isn't actually required
>> to begin submitting content to the sites that they register on.
>>
>> Use this how you will <3
>>
>> Jarland
>> _______________________________________________
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>> mailop@mailop.org
>> https://list.mailop.org/listinfo/mailop
>>
>
>
> --
>
> Ken Simpson
>
> CEO, MailChannels
> <https://www.mailchannels.com/?utm_source=Email%20Signature&utm_medium=Ken%20Simpson&utm_campaign=Website>
>
>
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-- 

Ken Simpson

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