EmailMessage django cc作为密件抄送

我正在使用EmailMessage类发送邮件，但遇到以下问题：

People marked in Cc receiving mails as bcc

再现结果的最小代码如下所示：

def send_mails(subject, html_message, sender_mail, recipient_list, bcc_list, cc_list, reply_to):
    headers = {'Cc': cc_list}
    email = EmailMessage(subject, html_message, sender_mail,
                         recipient_list, bcc_list, reply_to=reply_to, headers=headers)

    email.content_subtype = 'html'
    email.send()

headers = {'Cc': ','.join(cc_list)}

另外，如果我在某些请求中没有获得诸如cc、bcc之类的字段，该如何处理

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非常感谢您提供的任何帮助。

我必须在标题中传递Cc，如下所示：

def send_mails(subject, html_message, sender_mail, recipient_list, bcc_list, cc_list, reply_to):
    headers = {'Cc': cc_list}
    email = EmailMessage(subject, html_message, sender_mail,
                         recipient_list, bcc_list, reply_to=reply_to, headers=headers)

    email.content_subtype = 'html'
    email.send()

headers = {'Cc': ','.join(cc_list)}