解决：mail() : Failed to connect to mailserver at "127.0.0.1" port 25

当出现：
warning: mail() [function.mail]: Failed to connect to mailserver at "127.0.0.1" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in E:\TOOL\Apache\htdocs\rzchina_beta\club\includes\mail.inc on line 193.
Unable to send e-mail. Please contact the site administrator if the problem persists.
或出现：
mail(): SMTP server response: 550 5.7.1 Unable to relay for错误。
解决办法：
安装IIS自带的SMTP，在SMTP虚拟服务器上点击右键，在弹出的属性窗口里进行如下设置：
点击访问选项卡，再点击中继，在弹出的窗口出点击添加，然后选单台计算机，添加IP地址为 127.0.0.1。然后一路确定返回。(不进行此项设置，可能会出现：SMTP server response: 550 5.7.1 Unable to relay for [e-mail]。。。的错误)
测试一下：
<?php
mail("[e-mail]","测试","测试是否收到");
?>