Several factors contribute to diminished returns in email marketing:
1. Audience Saturation: Frequent emailing can lead to audience fatigue, causing subscribers to disengage or even unsubscribe. 2. Content Redundancy: Repetitive or irrelevant content can reduce the effectiveness of your emails. 3. List Quality: Over time, your email list may include inactive or uninterested subscribers, diminishing the overall engagement rate. 4. Technical Issues: Poor email deliverability due to spam filters or technical glitches can lead to reduced effectiveness.