Act as a seasoned email marketing consultant with 10+ years of experience in GDPR compliance. Provide a detailed guide on best practices for GDPR-compliant email marketing campaigns, tailored for [BUSINESS TYPE] such as [INDUSTRY]. Cover key areas including [EXPLICIT CONSENT METHODS], data storage protocols, and opt-out mechanisms. Explain how to segment audiences while adhering to GDPR rules, the importance of transparent privacy policies, and strategies for maintaining audit trails. Include real-world examples of compliant campaigns and common pitfalls to avoid. Ensure the advice is actionable and aligns with the latest [YEAR] regulations.