I'm building a site for a client who's e-mail system does not like UTF-8 as character set, although the wordpress site is buil on it. At least this is my guess as to why diacrtical characters like the Swedish åäöÅÄÖ becomes very messed up. And when he replies to clients, and they reply back in the end the conversation looks really weird.
I think I need to make contact form 7 send the e-mail with iso-8859-1 instead. How can I accomplish this..?