mairix-display-functions

mairix-display-functions is a variable defined in `mairix.el'.
Its value is

((rmail mairix-rmail-display)
 (gnus mairix-gnus-ephemeral-nndoc)
 (vm mairix-vm-display))

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

Documentation:
Specifies which function should be called for displaying search results.
This is an alist where each entry consists of a symbol from
`mairix-mail-program' and the corresponding function for
displaying the search results. The function will be called with
the mailbox file produced by mairix as the single argument.

You can customize this variable.