quoted printable and not 8bits when sending mail/news

[Uwe Brauer]

Hello

Sorry for the trivial question but how do I configure gnus such that
every outgoing message is mime coded with quoted printable instead of 
8bits
gnus-group-posting-charset-alist
tells me (message-this-is-mail nil nil)
that means always use qp not 8 bits, correct?

thanks

Uwe Brauer