[Mailman-Users] ?get a strange msg???

A member post a email to the maillist.Then get a strange response ------------------------------------------> subject:Your message to Oz_maillist awaits moderator approval content: Your mail to 'Oz_maillist' with the subject

=?gb2312?B?suLK1NTT1r4=?=

Is being held until the list moderator can review it for approval.

The reason it is being held:

Message has implicit destination

Either the message will get posted to the list, or you will receive notification of the moderator's decision. --------------------------------------------------------------> What is the reason?