Review the following steps until the issue is resolved:
  1. For labels that are not an Avery brand, look on the box or package for an Avery label number. Some non-Avery brand labels, such as a store brand, may note what Avery label type that it's equivalent to. Then look in the available labels in Mail to see if that number is listed.
  2. Look on the front of the label box or package for a label measurement, column count, and a row count. Use that information to review the available sizes to see if any match.
  3. If a similar existing label cannot be identified among the available ones, then create a custom labels file.