No idea whether it’s bots or real people, but I suspect it’s bots given the 
scale. We’re seeing thousands of unique sites per hour being “compromised” in 
this manner.

> On May 26, 2022, at 6:38 PM, Scott Mutter via mailop <mailop@mailop.org> 
> wrote:
> 
> Are you sure it's actual people registering or is it bots?
> 
> Do the sign up pages have effective captcha or other anti-bot/prove
> you're human measures?
> 
>> On Thu, May 26, 2022 at 7:30 PM Ken Simpson via mailop
>> <mailop@mailop.org> wrote:
>> 
>> 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
>>> 
>>> 
>>> Facebook  |  Twitter  |  LinkedIn |  Help Center
>>> 
>>> Our latest case study video: watch here!
>> 
>> 
>> 
>> --
>> 
>> Ken Simpson
>> 
>> CEO, MailChannels
>> 
>> 
>> Facebook  |  Twitter  |  LinkedIn |  Help Center
>> 
>> Our latest case study video: watch here!
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