Today, cybersecurity firm Proofpoint — which provides SaaS products to protect businesses’ email, social media and other services — announced that it would pay $110 million to acquire Cloudmark, another firm that provides security protection for messaging services, focusing specifically on serving the ISP and mobile carrier markets. “We are excited to welcome Cloudmark’s ISP and mobile carrier customers to Proofpoint,” said Gary Steele, Chief Executive Officer of Proofpoint. “By combining the threat intelligence from Cloudmark with the Proofpoint Nexus platform, we can better protect all of our customers – both enterprises and ISPs – from today’s rapidly evolving threats.”…