sendmail 启动慢解决办法

在修改/etc/hosts后sendmail启动的很慢，查了些资料，解决办法是
修改 /etc/hosts

修改前：
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1       localhost.localdomain   localhost
::1     localhost6.localdomain6 localhost6
127.0.0.1 yl

修改后：

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1       localhost.localdomain yl
::1     localhost6.localdomain6 localhost6
127.0.0.1 yl

最后一行 yl 是我新加的主机名子，这么改的原因自己google一把就知道了。