(2) 修改重写规则0
            重写规则0解析地址，寻找规则集0(在vi在找字符串S0)
            在其后加入：
            R$+.bbs<@>$* <tab>  $#bbsmail $:$1 <tab> bbs mail gateway
            R$+.bbs<@local>$* <tab> $#bbsmail $:$1 <tab> bbs mail gateway
        (3) 修改不带域名的本地地址
            在sendmail.cf中寻找
            # else we must be a local name
        在其后加入：
           R$+.bbs<tab> $#bbsmail $: $1 bbsmail gateway
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FROM 166.111.142.18