rmail-sort-by-recipient
rmail-sort-by-recipient is an interactive autoloaded Lisp function in `rmailsort.el
'.
(rmail-sort-by-recipient REVERSE)
Sort messages of current Rmail buffer by recipient.
This uses either the "To" or "Apparently-To" header, downcased.
If prefix argument REVERSE is non-nil, sorts in reverse order.