"Sig dashes" are the closest to a standard signature delimiter and consist of two dashes followed by one space and a newline (http://tools.ietf.org/html/rfc3676

"Sig dashes" are the closest to a standard signature delimiter and consist of two dashes followed by one space and a newline (http://tools.ietf.org/html/rfc3676#section-4.3 http://tools.ietf.org/html/rfc3676#section-4.3). They are widely supported by email and usenet software (Pine, mutt, Gmail, etc.)