SpamAssassin - Use this program to "Unspam" your mailbox(es).
Cloudflare DNS - Install the free app that makes your phone’s Internet more fast, private, and reliable.
Oikik Antispam - Oikik is a cloud-based email filtering service that works with your existing email service.
Amazon Route 53 - Amazon Route 53 is a highly available and scalable DNS web service.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
Google Cloud DNS - Reliable, resilient, low-latency DNS serving from Google’s worldwide network of Anycast DNS servers.