gnus-button-mid-or-mail-heuristic-alist

gnus-button-mid-or-mail-heuristic-alist is a variable defined in `gnus-art.el'.
Its value is shown below.

Documentation:
An alist of (RATE . REGEXP) pairs for `gnus-button-mid-or-mail-heuristic'.

A negative RATE indicates a message IDs, whereas a positive indicates a mail
address. The REGEXP is processed with `case-fold-search' set to nil.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.

Value:

((-10.0 . ".+\\$.+@")
 (-10.0 . "#")
 (-10.0 . "\\*")
 (-5.0 . "\\+[^+]*\\+.*@")
 (-5.0 . "@[Nn][Ee][Ww][Ss]")
 (-5.0 . "@.*[Dd][Ii][Aa][Ll][Uu][Pp]")
 (-1.0 . "^[^a-z]+@")
 (-5.0 . "\\.[0-9][0-9]+.*@")
 (-5.0 . "[a-z].*[A-Z].*[a-z].*[A-Z].*@")
 (-3.0 . "[A-Z][A-Z][a-z][a-z].*@")
 (-5.0 . "\\...?.?@")
 (-2.0 . "^[0-9]")
 (-1.0 . "^[0-9][0-9]")
 (-3.0 . "^[0-9][0-9a-fA-F][0-9a-fA-F][^0-9a-fA-F]")
 (-5.0 . "^[0-9][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][^0-9a-fA-F]")
 (-3.0 . "[0-9][0-9][0-9][0-9][0-9][^0-9].*@")
 (-3.0 . "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][^0-9].*@")
 (-3.0 . "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9].*@")
 (25.0 . "-dated-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]+.*@")
 (-20.0 . "\\.fsf@")
 (-20.0 . "^slrn")
 (-20.0 . "^Pine")
 (-20.0 . "^alpine\\.")
 (-20.0 . "_-_")
 (-20.0 . "\\.ln@")
 (-30.0 . "@ID-[0-9]+\\.[a-zA-Z]+\\.dfncis\\.de")
 (-30.0 . "@4[Aa][Xx]\\.com")
 (10.0 . "^[^0-9]+@")
 (3.0 . "^[^0-9]+[0-9][0-9]?[0-9]?@")
 (3.0 . "@stud")
 (2.0 . "[a-z][a-z][._-][A-Z][a-z].*@")
 (0.5 . "^[A-Z][a-z]")
 (0.5 . "^[A-Z][a-z][a-z]")
 (1.5 . "^[A-Z][a-z][A-Z][a-z][^a-z]")
 (2.0 . "^[A-Z][a-z][A-Z][a-z][a-z][^a-z]"))