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Reiner Steib <4.uce.03.r.s@nurfuerspam.de> writes:

> How about only changing the default of
> `mm-file-name-rewrite-functions' from `nil' to, say
> `mm-file-name-rfc-2183'?

We might as well split the different replacements up a little to make
it a bit easier to disable the ones you don't like.

What about adding these two to `mm-file-name-rewrite-functions' by
default:

(defun mm-file-name-delete-control (file-name)
  "Delete control characters from FILE-NAME."
  (gnus-replace-in-string file-name "[\x00-\x1f\x7f]" ""))

(defun mm-file-name-delete-gotchas (file-name)
  "Delete shell gotchas from FILE-NAME."
  (setq file-name (gnus-replace-in-string file-name "[<>|]" ""))
  (gnus-replace-in-string file-name "^[.-]*" ""))