Email deliverability and spam prevention guidelines

High inbox placement requires adherence to standard email authentication and deliverability practices. 1. Domain Authentication: Ensure your custom sending domain has configured SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC DNS records pointing to your email service provider. 2. DNS and MX Caching: The system automatically verifies destination MX records with domain-level caching to prevent connection timeouts during bulk dispatch. 3. Rate Throttling and Bounce Handling: Dispatch queues process recipients in controlled batches. If hard bounces or mailbox rejections occur, affected addresses are automatically marked to prevent repeated failed deliveries. 4. Content Best Practices: Avoid spam trigger words in subjects, maintain a balanced text-to-image ratio, and always provide clear sender identification and physical business address.