sendmail-coding-system

sendmail-coding-system is a variable defined in `sendmail.el'.
Its value is

nil

Documentation:
Coding system for encoding the outgoing mail.
This has higher priority than the default `buffer-file-coding-system'
and `default-sendmail-coding-system',
but lower priority than the local value of `buffer-file-coding-system'.
See also the function `select-message-coding-system'.