gnus-update-message-archive-method

gnus-update-message-archive-method is a variable defined in `gnus.el'.
Its value is

nil

Documentation:
Non-nil means always update the saved "archive" method.

The archive method is initially set according to the value of
`gnus-message-archive-method' and is saved in the "~/.newsrc.eld" file
so that it may be used as a real method of the server which is named
"archive" ever since. If it once has been saved, it will never be
updated if the value of this variable is nil, even if you change the
value of `gnus-message-archive-method' afterward. If you want the
saved "archive" method to be updated whenever you change the value of
`gnus-message-archive-method', set this variable to a non-nil value.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.