Engagement
Email engagement is how recipients interact with your emails, including opens, clicks, replies, conversions, unsubscribes, and other response signals.
Engagement is what recipients do after an email arrives: open it, click, reply, forward, convert, ignore it, unsubscribe, or report it as spam. Taken across sends, it shows whether an audience wants what you are sending.
Which signals to trust
An open or a click can come from a security scanner or a privacy feature rather than the reader, so treat both as directional. A reply or a conversion is stronger evidence that a person acted. Unsubscribes and spam reports are the clearest negative signals, and a spam report can reach you from the mailbox provider through a feedback loop.
Why it matters
Engagement tells you whether the content, the audience and the cadence fit. It is also the input to list hygiene: people who have not opened or clicked in months are candidates for less mail or a re-permission ask before they turn into bounces or complaints.
Common mistakes
Optimizing for opens without asking what the open led to. Judging the whole list as one audience instead of by segment, signup source or email type. Ignoring disengagement until it shows up as complaints, when the fix is harder than sending less would have been.