1. A system comprising: a resource handler configured to determine a uniform resource locator (URL) and a target recipient associated with the URL; a parser configured to parse the URL to determine a network address of a network resource and one or more tag-variable sets, each tag-variable set including a variable and a corresponding tag associated with the variable; a value engine configured to determine one or more values associated with the target recipient and corresponding to each variable included in the one or more tag-variable sets; a URL generator configured to replace, in the URL, the one or more tag-variable sets with a corresponding one or more tag-value sets, wherein the variable of each of the one or more tag-variable sets is replaced with the corresponding one or more values; and a delivery engine configured to provide the URL, including the network address of the network resource, to the target recipient, wherein upon a selection of the URL, the tag-value sets are provided to the network resource at the network address.