:type '(choice (const :tag "unique" unique)
(const :tag "unsent" unsent)))
-(defcustom message-default-charset nil
+(defcustom message-default-charset
+ (and (featurep 'xemacs) (not (featurep 'mule)) 'iso-8859-1)
"Default charset used in non-MULE XEmacsen."
:group 'message
:type 'symbol)