Self-addressed stamped envelope

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A self-addressed stamped envelope (SASE), or just stamped addressed envelope (SAE) in the UK, is often just that: an envelope with the sender's name and address on it, with affixed paid postage and mailed to a company or private individual. Often, SASEs are used when requesting information about products or services.

Companies and charities use SASEs in order to save on postage; a consumer can afford the cost of a stamp and envelope, but the business does not want to pay for the postage on all the letters it sends out.

One of the most common uses is when companies are legally required to send something upon request, such as a "winners list" at the end of a sweepstakes; the company will require an SASE with the request to avoid paying postage.

SASEs are also vital in the hobby of autograph collecting. An enthusiast will send a request to a celebrity or athlete through the mail. Included with the autograph request is an SASE, in which the celebrity or athlete is to return the autographed item.

[edit] International reply coupons

SASEs cannot easily be used for foreign mail, since senders rarely have supplies of mint foreign stamps. Rather, International reply coupons are used, and these can be purchased over the counter at Post Offices.