Ask the vendor how they collected the data and whether they have records of opt-in consent.

Prior consent is required, and the law explicitly states that consent does not transfer when a list is sold. 2. Choose a Reputable Data Provider

Request a small sample of the list to test deliverability and relevance before committing to a full purchase. 3. Clean and Verify the List Before Sending

Instead of buying "bulk spreadsheets" from unverified brokers, use reputable B2B data platforms that provide real-time verification.

If you choose to proceed with buying a list, follow these best practices to mitigate risk: 1. Evaluate Legal Compliance by Region