How does engagement factor into spam detection?

Engagement signals indicate whether recipients want email. High open rates, clicks, replies, and low complaints suggest desired messages. Low engagement and high complaints suggest unwanted email, regardless of technical spam indicators.

Engagement-based filtering personalizes. You might receive messages that would be spam for others because you engage with that sender. Filters learn individual preferences, not just global spam patterns.

For senders, engagement is critical. Even technically compliant email faces filtering if recipients don't engage. Build lists of genuinely interested subscribers, send relevant content, and let engagement demonstrate your email's value.