由於每天都要檢查mail server佇列，昨天就發現到有這個情形，公司內部很多員工寄給wenyunchao@gmail.com這個人，但是都沒辦法寄，卡在佇列上約有496筆，還在增加，佇列顯示的狀態如下:
host alt1.gmail-smtp-in.l.google.com[209.85.225.27] said: 450-4.2.1 The user you are trying to contact is receiving mail at a rate that 450-4.2.1 prevents additional messages from being delivered. Please resend your 450-4.2.1 message at a later time. If the user is able to receive mail at that 450-4.2.1 time, your message will be delivered. For more information, please 450 4.2.1 visit http://mail.google.com/support/bin/answer.py?answer=6592 ee6si1159493icb.71 (in reply to RCPT TO command)

有看了一下佇列內寄給這位User的信件，好像被當跳板寄給wenyunchao@gmail.com
信件內寄件者與佇列顯示的寄件者(公司人員)不一致
昨天有試著修改兩位一直寄的公司人員密碼，30分鐘內都沒再寄了，但是給他們密碼後又開始寄信了
有可能大約20-30個公司同事密碼被猜到嗎?

1.不曉得原因是為何?有沒有解決辦法呢?
2.是client的問題還是?server的問題?