Is it safe to use webmail on work computers? Security Experts from Proficio and STEALTHbits commented on the DHS Using Webmail on Work Computers. Proficio Inc. is a leading cloud-based Managed Security Service Provider (MSSP) SteALTHbits is internationally recognized in cyber security and Internet threat detection/prevention. Its access management solutions are used by public & private sector enterprises to block malicious access to unstructured data such as email, file systems, presentations, etc. ( 80% of organizational data)”]