-`qp-or-base64' has another effect. It will fold long lines so that
-MIME parts may not be broken by MTA. So do `quoted-printable' and
-`base64'.
-
-Note: It affects body encoding only when a part is a raw forwarded
-message (which will be made by `gnus-summary-mail-forward' with the
-arg 2 for example) or is neither the text/* type nor the message/*
-type. Even though in those cases, you can use the `encoding' MML tag
-to specify encoding of non-ASCII MIME parts."
+This list is only consulted when encoding MIME parts in the
+bodies -- not for the regular non-MIME-ish messages."