This does not surprise me, but they're different things. Name is usually related to a deprecated way to suggest a filename for attachments (this should be handled by Content-Disposition now), while the other is more text e-mail specific and deals with how nested replies should be displayed in variable-size windows - see here. So the question is: do you really need any of them?
Flavio
perl -ple'$_=reverse' <<<ti.xittelop@oivalf
Don't fool yourself.
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