#' Fetch mail information and zones from USPS
#'
#' Calculate shipping rates and times for packages and get the USPS zones corresponding to 3-digit and 5-digit zip code pairs.
#'
#' Contributors:
#' \itemize{
#' \item Amanda Dobbyn
#' }
#'
#'
#' To get postage information, use \code{fetch_mail}.
#' To get zones, use \code{get_zone_three_digit} or \code{get_zone_five_digit}.
#'
#' The zones vignette can be found with \code{browseVignettes(package = "postal")}.
#' @name postal
#' @docType package
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