Email holds the keys to the kingdom. All your password resets go through email, and abandoning an old domain name makes it easy for attackers to re-register the old domain and get your stuff.
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The problem is especially grave for law firms where partnerships form, dissolve, and merge often, security researcher Gabor Szathmari points out. A merger or acquisition typically involves either new branding for the new firm, with a new domain name to match, or the acquired firm dropping their old branding and domain name. Letting those old domains expire is dangerous.
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