gnus-gcc-post-body-encode-hook

gnus-gcc-post-body-encode-hook is a variable defined in `gnus-msg.el'.
Its value is

nil

• This variable may be risky if used as a file-local variable.

Documentation:
A hook called after encoding the body of the Gcc copy of a message.
The current buffer (when the hook is run) contains the message
including the message header. Changes made to the message will
only affect the Gcc copy, but not the original message.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.3 of Emacs.