Received an email today from them. Unsure how they got my mail address.

Subject:
[Bitmaintech.com]  Invoice Payment (#4142)

Message:
Invoice Payment Confirmation

Kind regards ,
Bitmain Tech

14836 E Valley Blvd
La Puente, CA 91746
Email: support@bitmaintech.com
Phone: (888) 933-2313

Attachment:
invoice_4142.jar

Using Gmail, it didn't reach my spam, right in my main inbox.