The encoding
variable in .mailrc does not affect Mailer behavior,
but it does set mailx function. To send e-mail in formats
other than 7-bit ASCII, such as to send (8-bit) Simplified Chinese characters
you must use /usr/SUNWale/bin/mailx. The encoding
variable in .mailrc
sets encoding formats for mailx.
International transmission conventions require that header information use only ASCII characters. So Simplified Chinese characters should not be used in the header (including the Subject line) with Mailer or with mailx.
The /bin/mailx application has not been localized and cannot send or receive Simplified Chinese characters.