Case Study: McMillan Williams Solicitors achieves prevention of accidental email data loss and mitigates data exfiltration risk with Proofpoint

Mitigating the Risk of Data Exfiltration in a Regulated Industry

McMillan Williams Solicitors (MW) is a top-10 UK conveyancing law firm serving over 1,000 new clients a month and employing around 450 people. With a high volume of email-driven workflows, the firm faced frequent risks from misdirected or unauthorized emails — human errors that could expose sensitive client data and create costly compliance headaches, including potential ICO reporting.

MW deployed Tessian Guardian and Enforcer, which integrated quickly with existing systems and used historical email patterns to block abnormal or non-business recipients. The solution delivered immediate results: the team now sees anomalies in real time via the Tessian dashboard, can identify incidents and responsible users faster, and has significantly reduced the time and risk associated with email-driven data loss.

McMillan Williams Solicitors

Charlotte Mays

Compliance and Data Protection Manager