Reason: The user-defined part of this email was embedded with spam， and it has been reported by many users. QQMail will prohibit the sending of such email content.
Suggestion: If you are the administrator of this email, please stop sending it and check the user-defined parts (such as nickname, recipient address, etc.An example is shown in Figure 1.)
in the mail,filter and fix the customized spam. If you are an individual user, please report this to your email provider.