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TrackingMode is how much one engagement channel may be observed. The scale is ordered by increasing collection, but the rank order lives in Go rather than in these numbers, so a Mode can be inserted mid-scale without renumbering the wire.
Used in: ,
States nothing, and so imposes no restriction of its own.
The channel is not observed at all.
Counted in aggregate only; nothing retained that isolates one recipient.
Linkable within a single batch, carrying no recipient identity. Reserved: selecting it is rejected as unsupported.
Attributed to the recipient.
Attributed, plus the IP address and user agent of the request.
TrackingPolicy is a pair of TrackingModes, one governing opens and one governing links. Stated at domain, batch and recipient level, where a lower level may only restrict what the level above allows.
Used in: , , , ,