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#### 9.18.3 Detecting Spam in Groups

To detect spam when visiting a group, set the group's `spam-autodetect` and `spam-autodetect-methods` group parameters. These are accessible with `G c` or `G p`, as usual (see Group Parameters).

You should set the `spam-use-*` variables for whatever spam back ends you intend to use. The reason is that when loading `spam.el`, some conditional loading is done depending on what `spam-use-xyz` variables you have set.

By default, only unseen articles are processed for spam. You can force Gnus to recheck all messages in the group by setting the variable `spam-autodetect-recheck-messages` to `t`.

If you use the `spam-autodetect` method of checking for spam, you can specify different spam detection methods for different groups. For instance, the ‘`ding`’ group may have `spam-use-BBDB` as the autodetection method, while the ‘`suspect`’ group may have the `spam-use-blacklist` and `spam-use-bogofilter` methods enabled. Unlike with `spam-split`, you don't have any control over the sequence of checks, but this is probably unimportant.