You can segment your contacts based on any data that's available in your Custom Properties. Similarly to Variables, you can select which properties you want to have available as criteria in the Segment Builder. You can always create a new segment from your Segments & Lists page.
Currently, we have a limit of 5 segmentable properties to start.
Note: There is a different selection of Custom Variables and Segmentable Properties. This is because some data might make sense to display in an email (eg a Referral URL) but not to segment, and vice-versa.
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