Email preview verifiedWritten by the Hub
Renders messages from the live stream — and pulls their tracking pixels while doing it.
In detail
The preview shows fully rendered mail taken from traffic passing through the node. It can be disabled in the configuration, and the console warns that images will be fetched. That warning is the whole point for us: a preview opened by an operator counts as an open in the customer's statistics, from the node's own address. On a shared node the operator is us, and the statistics belong to somebody else — which is why render-enabled deserves to be a per-node decision rather than a default.