Utah Code § 6-2-106

(1) Unless a creditor waives in a signed record the right to notification, an assignee shall send a notification of the assignment to each creditor known to the assignee within a reasonable time not to exceed 30 days after the effective date of the assignment agreement. (2) The notification must: (a) be in a record signed by the assignee; (b) include the assignee's name, address, and other contact information reasonably necessary to communicate with the assignee; (c) provide reasonable instructions for submitting a proof of claim using the method established by the assignee under Subsection 6-2-108(b)(e); and (d) identify the date established under Subsection 6-2-108(b)(f) by which each creditor whose claim is not otherwise allowed without a timely proof of claim under this chapter must submit a proof of claim. (3) An assignee shall use reasonable means to provide the information in Subsection (2) to unknown creditors, including by any means the assignor regularly used to: (a) provide information to the assignor's creditors; or (b) communicate information about the assignor, other than advertising, to the public.