在postfix站点上有个讨论主题，解决方法是在main.cf中做如下设置：
# your ISPs SMTP server name or IP address goes here
relayhost = smtprelay.someprovider.com
#
# this line disables spontaneous PPP connections
defer_transports = smtp
#
# this line disables dns lookups for mail. As you are using a relay you really dont need DNS. If you use this you should use an ip address for $relayhost.
disable_dns_lookups = yes
并在拨号脚本中加入：
/usr/sbin/sendmail -q,
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