[otrs] character set problems

Hi, I have the character set "iso-8859-1" in the Config file, but STILL I receive e-mails with a strange apostroph: cŽè This should be c`è. Also other instances, such as "l`appartamento" arrives as "lŽappartamento" This is true for messages I send and for ones that I receive! I want to use Italian AND German characters (besides english ones of course). So, which character set do I have to put in? Thanks, Marc