问题标题：
【英语翻译ThisisthePostfixprogramathostbjd.com.cn.I'msorrytohavetoinformyouthatthemessagereturnedbelowcouldnotbedeliveredtooneormoredestinations.Forfurtherassistance,pleasesendmailtoIfyoudoso,pleaseincludethisp】
问题描述：
英语翻译
ThisisthePostfixprogramathostbjd.com.cn.
I'msorrytohavetoinformyouthatthemessagereturned
belowcouldnotbedeliveredtooneormoredestinations.
Forfurtherassistance,pleasesendmailto
Ifyoudoso,pleaseincludethisproblemreport.Youcan
deleteyourowntextfromthemessagereturnedbelow.
ThePostfixprogram
:userunknown.Commandoutput:/usr/local/bin/maildrop:
Invaliduserspecified.
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