spam-report-gmane-use-article-number

spam-report-gmane-use-article-number is a variable defined in `spam-report.el'.
Its value is

t

Documentation:
Whether the article number (faster!) or the header should be used.

You must set this to nil if you don't read Gmane groups directly
from news.gmane.org, e.g. when using local newsserver such as
leafnode.

You can customize this variable.