Site name containing UTF-8 used with emails with Reply-To feature

I have an "é" (it's called création-handicap.ch) in my page title site name. so the from sender gets scrambled from my webform mails. here an extract from the email header: From: =?utf-8?Q?creation-handicap_via_Cr=C3=A9ation-Handicap?= in the attachements you see a screenshot..

10 Mar 2015 ... the site name is being included in the from sender name, but has no utf-8 support . also the E-mail-from-name field does not accept umlauts and ...

Lee mas