请教一下,邮件发送错误问题

邮件发送错误:Connection could not be established with host smtp.qq.com [Unable to find the socket transport "nullnull" - did you forget to enable it when you configured PHP? #32759]

网易163和和qq都试过了,邮箱服务SMTP都开启了,也配置正确了就是没办法测试发送。问一下提示该代码什么问题呢
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