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 "".