Your previous expert has asked me to review this matter. If you are not obtaining the information on their clients from the competitor directly (stealing their proprietary client lists) and are obtaining the information from other sources, then as long as you comply with the CAN-SPAM Act and can prove you obtained the client information from a publicly available source, then the competitor cannot sue you for contacting their clients, this is called free market competition and you have a right to advertise to targeted clients who can use your product.
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