Mesh provides email security solutions designed exclusively for Managed Service Providers (MSPs). The company was founded in 2020 by Ralph Casey, Brian Byrne, and Daimhin Kavanagh, who previously worked together at another email security company serving MSPs for over a decade. They identified that MSPs needed a platform specifically designed for their unique requirements rather than enterprise-focused solutions.

The company offers three main products: Mesh Gateway, which blocks advanced threats at the perimeter before they reach the inbox; Mesh 365, which provides API-based protection that integrates with Microsoft 365 to detect threats that evade Microsoft's native security; and Mesh Unified, which combines both perimeter and mailbox protection. These solutions protect against various email-based threats including business email compromise, phishing, spear-phishing, ransomware, payment fraud, CEO fraud, whaling, brand impersonation, malware, display name spoofing, supply chain fraud, and sextortion.

Mesh operates on a channel-only model, working exclusively with MSPs and never competing with them for end-client business. The platform includes features tailored for MSP operations such as automated billing systems, PSA integrations, concierge migration services, and custom-branded marketing materials. The company provides technical documentation, support services, and resources specifically designed to help MSPs deliver email security services to their small and medium-sized business clients.