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### 3.1 Summary Buffer Format

Gnus will use the value of the `gnus-extract-address-components` variable as a function for getting the name and address parts of a `From` header. Two pre-defined functions exist: `gnus-extract-address-components`, which is the default, quite fast, and too simplistic solution; and `mail-extract-address-components`, which works very nicely, but is slower. The default function will return the wrong answer in 5% of the cases. If this is unacceptable to you, use the other function instead:

         (setq gnus-extract-address-components
               'mail-extract-address-components)

`gnus-summary-same-subject` is a string indicating that the current article has the same subject as the previous. This string will be used with those specs that require it. The default is `""`.