SPF, DKIM, and DMARC are crucial for email deliverability with Cvent. Cvent supports DKIM, requiring key setup and DNS publication. DMARC builds on SPF/DKIM, providing policies for authentication failure handling. Correct SPF records, including Cvent's IPs, are vital. DMARC policies, from 'none' to 'reject,' affect deliverability. Monitoring DMARC reports is essential. Consider a dedicated sending domain and IP warm-up. Maintain a good sender reputation. Some businesses block emails not from their MX servers, so testing is needed. Regularly update SPF records to reflect changes.