Guardian Mail is an email threat protection solution developed by Abusix. It uses blocklists as a core mechanism to filter and block malicious email traffic before it reaches mail servers, claiming to block over 99.6% of email threats. The product is designed around a multi-layered defense approach, combining several detection and filtering mechanisms to protect mail infrastructure. It is positioned as a cost-effective solution suitable for network operators, ISPs, and enterprises concerned with maintaining their network and sender reputation. Guardian Mail is trusted by major telecommunications and technology companies including Swisscom, KPN, Vodafone, Mimecast, Cloudflare, AWS, and Akamai, indicating it is built to operate at scale for large organizations and service providers. Key protection areas include: - Blocking spam and malicious email content - Protecting network and sender reputation - Preventing harmful content from reaching mail servers - Providing layered defense mechanisms via blocklists The solution is delivered as a service, accessible via the Abusix application portal.