WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Palo Alto Networks WildFire - Firewall and Threat Intelligence
SignMyEmails - Everything you need for an amazing Html Email Signature.
FireEye Security Suite - An enterprise-grade security solution for mid-market customers, combining detection, protection, and response capabilities for network, email and endpoint.
Signature Maker - Signature Maker helps you create digital signature online. Signature creator is a simple, fast and free tool for making custom electronic/email/font signature.
Zscaler Web Security - Zscaler offers cloud-based web security solutions.