postfix无法给多个人发送邮件，错误日志：
Dec 16 18:25:18 mail postfix/pipe[6725]: 18E9485D864D: to=, relay=maildrop, delay=912, delays=912/0.01/0/0.01, dsn=4.3.5, status=deferred (mail system configuration error)
Dec 16 18:25:18 mail postfix/pipe[6725]: 18E9485D864D: to=, relay=maildrop, delay=912, delays=912/0.01/0/0.01, dsn=4.3.5, status=deferred (mail system configuration error)
Dec 16 18:25:18 mail postfix/pipe[6725]: warning: pipe flag `D' requires maildrop_destination_recipient_limit = 1
Dec 16 18:25:57 mail postfix/postfix-script[6739]: refreshing the Postfix mail system
Dec 16 18:25:57 mail postfix/master[4808]: reload -- version 2.8.2, configuration /etc/postfix
解决方法：
编辑/etc/postfix/main.cf，添加：