I think your real question is "do I have to wear a mask at my neighborhood postal station." Whether it is mandated in a particular place or not, you should wear a mask when around others not of your household. It's going to be a long time before enough people are vaccinated to give us herd immunity and wearing masks and washing our hands is our best defense until then. It's such a small thing, really. Please do it, to protect yourself and others.
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