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It is false that you cannot use a referral link in an email. Referral links are commonly used in email marketing campaigns to track conversions and reward referrers. Many businesses encourage customers to share referral links via email to expand their reach and acquire new customers. There are no technical or policy restrictions that universally prevent the use of referral links in email. The statement "Verdadero" (True) would be incorrect because it implies a universal prohibition that does not exist.