What does SASE stand for re: mail?

Self-addressed stamped envelope

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.


Please submit your product return with a SASE, which we will use to send back a receipt confirmation of the return
A Redditor asking about tracking SASEs
A Redditor asking about tracking SASEs

Related Slang


Updated August 22, 2023

SASE definition by

This page explains what the acronym "SASE" means. The definition, example, and related terms listed above have been written and compiled by the team.

We are constantly updating our database with new slang terms, acronyms, and abbreviations. If you would like to suggest a term or an update to an existing one, please let us know!