PITTSBURGH, Pennsylvania & HANNOVER, Germany–(BUSINESS WIRE)–Hornetsecurity Group, a leading cloud email security provider, has announced its second acquisition this year. Hot on the heels of its acquisition of worldwide backup solution provider Altaro in January, it has now acquired Zerospam, email protection specialists headquartered in Montreal, Canada. Zerospam is a fast-growing business that serves more than 4,000 small, midsized and enterprise customers worldwide via an ecosystem of 400