Answer: encls

AnswerCrossword Clue
ENCLSEnv. contents besides letters
ENCLSDocs. sent with the letter
ENCLSThings with ltrs.
ENCLSLtr. accompaniers
ENCLSSASEs, e.g.
ENCLSFenced areas: Abbr.
ENCLSPens: Abbr.
ENCLSBottom-of-letter abbr.
ENCLSCover ltr. accompaniers
ENCLSBus. cards in commercial mailings, e.g.
ENCLSS.A.S.E.'s, e.g.
ENCLSWhat SASEs are