請問一下為何收件人是空白的呢

[gainlong]

如題
我啟動了防制廣告的信件
但是我發現了
我會收到收件者是空白的
如何處理呢
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From: =?Big5?B?pGqleKVfrsmlTrDqu9o=?= <nlakn.nlakn@yahoo.com.cn>
Subject: **SPAM** =?Big5?B?pf6lwa1ewMsvVE9FSUOrT7X9r1otpXWtbjg2pLg=?=
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Date: Wed, 22 Dec 2004 17:06:43 +0800
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[Arnor]