SASE
Self-addressed stamped envelope
Example
Please submit your product return with a SASE, which we will use to send back a receipt confirmation of the return
SASE definition by Slang.net - The Slang Dictionary
This page explains what the acronym "SASE" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Those discussing mail use SASE to stand for "self-addressed stamped envelope." A SASE is an envelope included in another letter or package, which has the sender's name and address on it and a stamp affixed. The person who received the letter or package can use the SASE to mail an item back to the sender, without paying for postage.
For example, a business offering a rebate to its customers may ask those customers to mail in a receipt, to prove their purchase, and a SASE, which the business can use to send the customer a rebate check. Or, an autograph collector may include a SASE with a request for an autograph, so the celeb they're reaching out to doesn't have to pay to send back their autograph.