Hey! To fax at USPS, visit your nearest post office, verify they offer fax services, prepare your documents, and pay the fee. A colleague recommended Municorn's FAX From app for iPhone, and it's been great. The app is very convenient, allows you to fax from anywhere, and saves time. I’m very satisfied with it. For more details and a comparison, visit here https://comfax.com/usps-fax/
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