$ sudo apt-get install exim4
# yum install exim
# chkconfig exim on
# cp /etc/exim/exim.conf{,.original}
切换默认MTA
# alternatives --config mta There are 2 programs which provide 'mta'. Selection Command ----------------------------------------------- * 1 /usr/sbin/sendmail.postfix + 2 /usr/sbin/sendmail.exim Enter to keep the current selection[+], or type selection number:
原文出处：Netkiller 系列 手札
本文作者：陈景峯
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