

Large Envelopes (flats) Treated as Small Packages Letters that exceed the First-Class standard envelope maximum length, height, or thickness are charged large envelope (flat) prices. They are charged a nonmachinable surcharge even if they weigh less than 1 oz. Unusually shaped mail, like square or vertical envelopes, lumpy envelopes, rigid envelopes, and mail with clasps, string, or buttons, must be hand-canceled. Additional size restrictions apply depending on the type of mailpiece you're sending.Īdditional Charges for Irregular Mailpieces & Envelopes Nonmachinable Envelopes

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 ®.
