Additional size restrictions apply depending on the type of mailpiece you're sending.Īdditional Charges for Irregular Mailpieces & Envelopes Nonmachinable Envelopes All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply.Maximum weight for First-Class Mail letters is 3.5 oz for large First-Class Mail envelopes, the maximum weight is 13 oz.Large envelopes (flats) start at $1.35.Oversized postcards need letter stamps, which start at $0.66.Standard-sized, rectangular postcard stamps start at $0.51.Square, oversized, or unusually shaped envelope stamps start at $1.06.Standard-sized, rectangular envelope stamps start at $0.66.Standard Letter & Postcard Sizes See Insurance & Extra Services Letters One price for up to 3.5 ounces with commercially priced letters and cards.
Eligible for Delivery Confirmation ™ services such as Certified Mail ®.
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