Problem with encoding

Hi,
First of all, this is great class, works like a charm.
I do not attribute my problem to your class, but to my ignorance....
Here's the deal : if i use characters like : Ć,č,ž etc in sender field (from Thunderbird) when i receive mssg FROM field becomes something like : =?UTF-8?B?xaB0YSBpbWEgbm92bw==?=
I tried utf8_decode in php, but it doesn't work...
Do you have any ideas how to resolve this?

P.S> Sorry for my English...

Sorry, decoding....
:(

This subject is double encloded, the first part tells you what the secound encoding is. I belive the first encoding might be base64, but you should look that up in the email specs.