So, to recap, you don't control what character sets you are getting from your HTML form submission. This has very little to do with the way you're sending mail, and everything to do with how HTTP does not specify the character set it is sending form data in. The usual approach to solving that problem is to add an explicit encoding to every HTML page containing a form and hoping that the browser will use that encoding when sending the data. Some browsers also send some header indicating the character set.