lette
messenger
missile
document
text
textual matter
aerogram
aerogramme
air letter
airmail letter
business letter
chain letter
cover letter
covering letter
crank letter
dead letter
dead mail
encyclical
encyclical letter
epistle
fan letter
form letter
invitation
letter of intent
open letter
pastoral
personal letter
round robin
despatch
dispatch
telegram
derisive
dismissive
permissive
submissive