Кодировка при отправке EMail .Net

[Dreadlock]

Всем привет!

Никто не сталкивался с проблемой, когда хочешь отправить письмо с сервера и указываешь кодировку koi8-r, то падает AOS?

Вот примерный код:

try
    {
        interopPermission.assert();

        //mailAddressFrom     = new System.Net.Mail.MailAddress(emailTable.SenderAddr, emailTable.SenderName);
        If (emailTable)
            //BP deviation documented
            mailAddressFrom     = new System.Net.Mail.MailAddress(emailTable.SenderAddr, emailTable.SenderName);
        else
            //BP deviation documented
            mailAddressFrom     = new System.Net.Mail.MailAddress(_mailSenderAddr, _mailSenderName);
        //BP deviation documented
        mailAddressTo       = new System.Net.Mail.MailAddress(_emailAddr);
        //BP deviation documented
        mailMessage         = new System.Net.Mail.MailMessage(mailAddressFrom, mailAddressTo);
        
//////////---->
        // Вот это коварное место
        mailMessage.set_BodyEncoding(System.Text.Encoding::GetEncoding('KOI8-R'));

        //Вот так получается нормально
        mailMessage.set_BodyEncoding(System.Text.Encoding:get_ASCII());
///////////-----<
        //BP deviation documented
        mailMessage.set_Subject(_mailSubject);
        //BP deviation documented
        mailMessage.set_Body(_mailBody);
        //BP deviation documented

        If (_fileName)
        {
            attachmentCollection = mailMessage.get_Attachments();
            //BP deviation documented
            attachment = new System.Net.Mail.Attachment(_fileName);
            attachmentCollection.Add(attachment);
        }

        //BP deviation documented
        smtpClient          = new System.Net.Mail.SmtpClient(emailParams.SMTPRelayServerName, emailParams.SMTPPortNumber);
        //BP deviation documented
        networkCredential   = new System.Net.NetworkCredential(emailParams.SMTPUserName, password);
        //BP deviation documented
        credentialCache     = new System.Net.CredentialCache();
        credentialCache.Add(emailParams.SMTPRelayServerName, emailParams.SMTPPortNumber, "Basic", networkCredential);
        smtpClient.set_Credentials(credentialCache);

        smtpClient.Send(mailMessage);

        If (_fileName)
        {
            attachmentCollection.Dispose();
            attachment.Dispose();
        }

        CodeAccessPermission::revertAssert();
    }
    
    catch
    {

        infoLog.clear(lineNum); 
        //BP deviation documented
        systemException                 = CLRInterop::getLastException();
        smtpFailedRecipientsException   = systemException.get_InnerException();
        errorMessage                    = smtpFailedRecipientsException.get_Message();
        isEMailSended                   = checkFailed(strFmt("Ошибка: %1", errorMessage));

        CodeAccessPermission::revertAssert();
    }