Case Study: Osborne Clarke achieves spam elimination and 24/7 email continuity with Mimecast

Protecting the delivery of legitimate email

Osborne Clarke, a leading European law firm with over 700 people across 18 locations, relies on email as the hub for client communications and business systems. The firm was hit by escalating spam—including a 1.5 million-message email-based DDoS in a single day—which strained on‑premises anti‑spam tools and ISP relays, caused severe latency, and created time‑consuming false‑positive quarantine problems that hurt productivity.

After evaluating options Osborne Clarke chose Mimecast’s cloud-based unified email management (security, continuity and archiving), which uses on‑the‑wire filtering to drop spam at source. Implemented in days, the service immediately stopped in excess of 1.5 million spam messages a day, eliminated latency and quarantine issues, increased user productivity and satisfaction, reduced help‑desk queries, and delivered always‑on, carrier‑grade email protection with predictable per‑user costs.

Osborne Clarke

Nathan Hayes

Head of Infrastructure and Technology