![USPS Mailing Guidelines for First Class Mail - Letters, Postcards, Envelopes & Packages - MITO Studios USPS Mailing Guidelines for First Class Mail - Letters, Postcards, Envelopes & Packages - MITO Studios](https://www.mitostudios.com/wp-content/uploads/2012/01/usps_phx_domestic_lrg_env.jpg)
USPS Mailing Guidelines for First Class Mail - Letters, Postcards, Envelopes & Packages - MITO Studios
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U.S. Postal Service on X: "Packages more than 13 oz & bearing only postage stamps must be presented to a postal employee at a retail counter. http://t.co/dp0pbmWefM" / X
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Where to affix shipping label on large mail envelope? Anywhere or top right corner? I'm a Canadian dropping mail when in US. : r/USPS
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