This ebook provides a comprehensive guide to ensuring marketing and transactional emails consistently reach customer inboxes in an increasingly crowded and regulated environment. It explains why email remains a critical channel, citing global usage growth and revenue impact, while highlighting that nearly one in six emails never reaches the intended inbox. The document explores the evolving deliverability landscape, emphasizing speed, engagement, and personalization as key success factors. It details best practices for building trust with mailbox providers through authentication protocols such as SPF, DKIM, and DMARC, supported by regional delivery benchmarks. Common mistakes that damage sender reputation—such as poor list hygiene, inconsistent sending patterns, and weak subscription proce

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