I also checked exim packages 3.35-1 and 3.36-4 (from woody and sid). All versions exhibit the same behavior.
I also tried KMail. It works properly, using the same local sendmail program. So I guess Evolution is using exim's sendmail program incorrectly. ps. If you see my name e-mail address in the BCC field of this letter, then something is still very-very wrong... > -- > Csillag Kristóf <[EMAIL PROTECTED]>