System.Net.Mail发邮件异常，求帮助

[abc4403022]

我用的qq邮箱，在win8系统中可以发送，带附件也可以发送，
放到windows server2003中，不带附件可以发送，带了附件就发不出去，错误信息：


System.Net.Mail.SmtpException: Failure sending mail. ---> System.FormatException: An invalid character was found in the mail header: '周'.
at System.Net.Mime.MailBnfHelper.GetTokenOrQuotedString(String data, StringBuilder builder)
at System.Net.Mime.ContentDisposition.ToString()
at System.Net.Mime.ContentDisposition.PersistIfNeeded(HeaderCollection headers, Boolean forcePersist)
at System.Net.Mime.MimeBasePart.get_Headers()
at System.Net.Mime.MimePart.Send(BaseWriter writer)
at System.Net.Mime.MimeMultiPart.Send(BaseWriter writer)
at System.Net.Mail.Message.Send(BaseWriter writer, Boolean sendEnvelope)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
--- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at DataBaseManage.Email.sendEmail(String sendServer, Int32 port, String sEmail, String sendPwd, String cEmail, String files, String Subject, String Body)

[全栈极简]

An invalid character was found in the mail header: '周'. 在邮件头部找到一个非法字符‘周’，这是什么？

[Regan-lin]

System.FormatException: An invalid character was found in the mail header: '周'. 看你文件头，格式异常！

[errolsun]

我也遇到了此问题

[dclcl]

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