39 C.F.R. § 501.7
(b) The provider must affix to all meters a cautionary message providing the meter user with basic reminders on leasing and meter movement.
(1) The cautionary message must be placed on all meters in a conspicuous and highly visible location. PROPERTY OF [NAME OF PROVIDER] as well as the provider's toll-free number must be emphasized by capitalized bold type and preferably printed in red. The minimum width of the message should be 3.25 inches, and the minimum height should be 1.75 inches. The message should read as follows:
RENTED POSTAGE METER-NOT FOR SALE PROPERTY OF [NAME OF PROVIDER] (800) ###-#### Use of this meter is permissible only under U.S. Postal Service authorization. Call [Name of Provider] at (800) ###-#### to relocate/return this meter. WARNING! METER TAMPERING IS A FEDERAL OFFENSE. IF YOU SUSPECT METER TAMPERING, CALL POSTAL INSPECTORS AT (800) 372-8347 REWARD UP TO $50,000 for information leading to the conviction of any person who misuses postage meters resulting in the Postal Service not receiving correct postage payments.
(c) The provider must ensure that any matter printed by a Postage Evidencing System, whether within the boundaries of the indicia or outside the clear zone as defined in DMM 604.4.0 and the Intelligent Mail Indicia Performance Criteria (IMI-PC), is:
(d) Providers must also ensure that customers acknowledge, agree, and warrant in writing that:
[71 FR 65733, Nov. 9, 2006, as amended at 78 FR 44439, July 24, 2013; 82 FR 60118, Dec. 19, 2017; 85 FR 21777, Apr. 20, 2020; 85 FR 78235, Dec. 4, 2020]