We have noticed the uptick in emails from the domain as well and are currently blocking 99% of the emails they have sent to our servers so far. Out of the close to 1 million emails a small fraction appears to have gone to user inboxes - if you receive one in your inbox please mark the email as spam for our filter to learn more about the emails and help its accuracy in filtration.
Thank you, but they do go directly to my spam file. It's just that I get 25 a day, and it seems to have happened very suddenly. I was just wondering if there's a way to block them completely.