Use an information service of computer emergency response teams (CERT). They usually provide subscription lists. US-CERT can be found here: https://public.govdelivery.com/accounts/USDHSUSCERT/subscrib...
Use an information service of computer emergency response teams (CERT). They usually provide subscription lists. US-CERT can be found here: https://public.govdelivery.com/accounts/USDHSUSCERT/subscrib...