message-cite-style

message-cite-style is a variable defined in `message.el'.
Its value is

nil

Documentation:
*The overall style to be used when yanking cited text.
Value is either `nil' (no variable overrides) or a let-style list
of pairs (VARIABLE VALUE) that will be bound in
`message-yank-original' to do the quoting.

Presets to impersonate popular mail agents are found in the
message-cite-style-* variables. This variable is intended for
use in `gnus-posting-styles', such as:

((posting-from-work-p) (eval (set (make-local-variable 'message-cite-style) message-cite-style-outlook)))

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.