("^\\(From\\|Reply-To\\):" ": *\\(.+\\)$"
1 (>= gnus-button-message-level 0) gnus-button-reply 1)
("^\\(Cc\\|To\\):" "[^ \t\n<>,()\"]+@[^ \t\n<>,()\"]+"
- 0 (>= gnus-button-message-level 0) gnus-button-mailto 0)
+ 0 (>= gnus-button-message-level 0) gnus-msg-mail 0)
("^X-[Uu][Rr][Ll]:" gnus-button-url-regexp
0 (>= gnus-button-browse-level 0) browse-url 0)
("^Subject:" gnus-button-url-regexp