Attachment (4)
'attachment' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for appendage that I've seen before include "Addendum" , "Something attached to a larger thing" , "Thing attached to another" , "An outgrowth" , "Attached item" .)
'attachment' is the definition.
(I know that attachment can be written as bond)
This is all the clue.
(Other definitions for bond that I've seen before include "Unite" , "Link, connection" , "Financial asset" , "Fastening; financial certificate" , "Contract" .)
(Other definitions for email that I've seen before include "Electronic communication" , "Spam perhaps" , "Internet-borne communication" , "Messages between computer terminals" , "Messages via the internet" .)