Answer: SASES

AnswerCrossword Clue
SASESThey may be included with contest submissions: Abbr.
SASESPostpaid courtesies: Abbr.
SASESEpistolary courtesies: Abbr.
SASESThey're often sent with mss.
SASESSeizes: Obs.
SASESEnvelopes' enclosures: Abbr.
SASESAuthor's supply: Abbr.
SASESMS. adjuncts
SASESLetter enclosures: Abbr.
SASESPostal conveniences: Abbr.
SASESSubmitters' encls.
SASESWedding invitation encls.
SASESMS. dos?
SASESSome encls.
SASESThey aid responses, in brief
SASESSome letter enclosures, for short
SASESEncls. to editors
SASESSome contest entries: Abbr.
SASESThey may go with unsolicited manuscripts: Abbr.
SASESFreelancer's supply (Abbr.)
SASESFreelancer's enc.'s
SASESInvitation enclosures (Abbr.)
SASESMS accompaniers
SASESManuscript encs.
SASESReturn mail courtesies (Abbr.)
SASESSome encs.
SASESReturn-mail encs.
SASESSubmitter's encls.
SASESCertain encs.
SASESEnvelope encs.
SASESReturn reply conveniences: Abbr.
SASESCertain encls.
SASESLetter enclosures (abbr.)
SASESWedding invitation encs.
SASESEnclosures to eds.
SASESRSVP facilitators
SASESMS. enclosures
SASESMs. enclosures
SASESPpd. enclosures
SASESFreelance writers' encls.