Hil all, sorry for my english

When I try fetch e mails over blackberry through IMAP ports I take below log;

2010-05-08 09:09:20,919 INFO [ImapServer-403] [name=xxx@xxx.xx;mid=645;ip=x.x.x.x;] imap - S: f BAD parse error: unknown FETCH attribute \"RFC822.SÄ°ZE\"

there is a Turkish character in RFC822.SİZE,
same blackberry can fetch e mails from other IMAP servers, I call to blackberry service provider but they affirm that the problem is in your IMAP server,
but I can fetch with outlook or other mobiles through my IMAP ports,

Is there any idea??