Gnus Manual. Node: Article Signature

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3.17.7: Article Signature

Each article is divided into two parts---the head and the body. The body can be divided into a signature part and a text part. The variable that says what is to be considered a signature is gnus-signature-separator. This is normally the standard `^-- $' as mandated by son-of-RFC 1036. However, many people use non-standard signature separators, so this variable can also be a list of regular expressions to be tested, one by one. (Searches are done from the end of the body towards the beginning.) One likely value is:

(setq gnus-signature-separator
      '("^-- $"         ; The standard
        "^-- *$"        ; A common mangling
        "^-------*$"    ; Many people just use a looong
                        ; line of dashes.  Shame!
        "^ *--------*$" ; Double-shame!
        "^________*$"   ; Underscores are also popular
        "^========*$")) ; Pervert!

The more permissive you are, the more likely it is that you'll get false positives.

gnus-signature-limit provides a limit to what is considered a signature.

  1. If it is an integer, no signature may be longer (in characters) than that integer.
  2. If it is a floating point number, no signature may be longer (in lines) than that number.
  3. If it is a function, the function will be called without any parameters, and if it returns nil, there is no signature in the buffer.
  4. If it is a string, it will be used as a regexp. If it matches, the text in question is not a signature.

This variable can also be a list where the elements may be of the types listed above. Here's an example:

(setq gnus-signature-limit
      '(200.0 "^---*Forwarded article"))

This means that if there are more than 200 lines after the signature separator, or the text after the signature separator is matched by the regular expression `^---*Forwarded article', then it isn't a signature after all.

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