Using Audio Captcha in email marketing serves multiple purposes:
1. Accessibility: It makes your email sign-up forms more accessible to a wider audience, including those who are visually impaired. 2. Security: It helps in preventing spam and bot attacks, ensuring that your mailing list is clean and filled with real human subscribers. 3. User Experience: Offering an alternative to visual CAPTCHA improves the user experience for subscribers who may have difficulty with visual tasks.