To reduce spam reports, ensure your emails are relevant and not overly frequent. Segment your audience to deliver targeted content based on subscriber interests and behaviors. Avoid using excessive sales language, as spam filters often flag terms like 'Buy Now!' or 'Free.' Include a clear unsubscribe link to prevent people from marking emails as spam. Test different sending times and frequencies, as some subscribers may find daily emails too much but weekly ones acceptable. Regularly cleaning your email list to remove inactive subscribers can also help maintain better engagement and reduce spam complaints.