As a result of the uncertainty with COVID-19 related to the “Delta Variant,” the Postal Service will reinstate our previous face covering policy for all Mail Processing and Logistics, Retail and Delivery, and Vehicle Operations facilities.
https://www.ruralinfo.net/wp-content/uploads/2021/08/Mandatory-Face-Covering-Policy-Revised-082721.pdf

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I don’t agree with this . We will be living with this virus forever , it will never go away.