pub const LIST_ACTIONS: [(&str, &str); 6];Expand description
mutt’s list-action menu, in its order: the RFC 2369 List-* headers
a message may carry, each with the URL mutt would act on. mutt
takes the first <mailto:...> in the header and nothing else;
here a header holding only other schemes keeps its first URL, so
the answer can be “only mailto: is supported” rather than “none”.