在使用的过程当中，我们经常会用到邮件功能。WordPress 自带了 mail 函数，但用自带的 mail 函数来发送邮件的时候很容易失败或者被拒收。因此很多人选择使用更方便高效的 SMTP 来发送邮件。很多朋友都是使用插件实现 SMTP 发送邮件，如：、 WP-Mail-SMTP。今天我们介绍一下不使用插件来实现 SMTP 发送邮件的方法。

切换到主题目录，打开 functions.PHP 文件，添加如下代码：

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Crayon-toolbar" data-settings=" mouSEOver overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">Crayon-title">functions.PHP

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Crayon-button Crayon-plain-button" title="Toggle Plain Code">

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Crayon-button Crayon-wrap-button" title="Toggle Line Wrap">

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Crayon-button Crayon-expand-button" title="Expand Code">

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Crayon-button Crayon-copy-button" title="Copy">

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isSMTP();
    $<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>mailer->SMTPAuth = true;            // 启用SMTPAuth服务
    $<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>mailer->Port = 465;                 // SMTP<a href="/tag/youjian/" target="_blank" class="keywords">邮件</a>发送端口，常用端口有：25，安全<a href="/tag/lianjie/" target="_blank" class="keywords">链接</a>端口：465、587
    $<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>mailer->SMTPSecure = 'ssl';         // 是否通过SSL<a href="/tag/lianjie/" target="_blank" class="keywords">链接</a>，如果端口为25，则此处将“ssl”改为空白即可''，否则不必改动
    $<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>mailer->Host = 'smtp.gmail.com';    // SMTP服务器地址，在<a href="/tag/youjian/" target="_blank" class="keywords">邮件</a>设置或者帮助中心可以找到
    $<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>mailer->Username = '****@****.com'; // 您的<a href="/tag/youjian/" target="_blank" class="keywords">邮件</a>地址
    $<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>mailer->Password = '*********';     // 你的邮箱登陆密码
}
 
add_action('<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>mailer_init','mail_smtp');

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Crayon-num Crayon-striped-num" data-line="Crayon-5c891d512a82f630727518-2">2

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Crayon-num" data-line="Crayon-5c891d512a82f630727518-5">5

Crayon-num Crayon-striped-num" data-line="Crayon-5c891d512a82f630727518-6">6

Crayon-num" data-line="Crayon-5c891d512a82f630727518-7">7

Crayon-num Crayon-striped-num" data-line="Crayon-5c891d512a82f630727518-8">8

Crayon-num" data-line="Crayon-5c891d512a82f630727518-9">9

Crayon-num Crayon-striped-num" data-line="Crayon-5c891d512a82f630727518-10">10

Crayon-num" data-line="Crayon-5c891d512a82f630727518-11">11

Crayon-num Crayon-striped-num" data-line="Crayon-5c891d512a82f630727518-12">12

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Crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">

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Crayon-line Crayon-striped-line" id="Crayon-5c891d512a82f630727518-2">Crayon-sy">{

Crayon-line" id="Crayon-5c891d512a82f630727518-3">Crayon-h">Crayon-sy">$Crayon-v">PHPmailerCrayon-e">isSMTPCrayon-sy">(Crayon-sy">)Crayon-sy">;

Crayon-line Crayon-striped-line" id="Crayon-5c891d512a82f630727518-4">Crayon-h">Crayon-sy">$Crayon-v">PHPmailerCrayon-v">SMTPAuthCrayon-h"> Crayon-o">=Crayon-h"> Crayon-t">trueCrayon-sy">;Crayon-h">Crayon-c">// 启用SMTPAuth服务

Crayon-line" id="Crayon-5c891d512a82f630727518-5">Crayon-h">Crayon-sy">$Crayon-v">PHPmailerCrayon-v">PortCrayon-h"> Crayon-o">=Crayon-h"> Crayon-cn">465Crayon-sy">;Crayon-h"> Crayon-c">// SMTP邮件发送端口，常用端口有：25，安全链接端口：465、587

Crayon-line Crayon-striped-line" id="Crayon-5c891d512a82f630727518-6">Crayon-h">Crayon-sy">$Crayon-v">PHPmailerCrayon-v">SMTPSecureCrayon-h"> Crayon-o">=Crayon-h"> Crayon-s">'ssl'Crayon-sy">;Crayon-h"> Crayon-c">// 是否通过SSL链接，如果端口为25，则此处将“ssl”改为空白即可''，否则不必改动

Crayon-line" id="Crayon-5c891d512a82f630727518-7">Crayon-h">Crayon-sy">$Crayon-v">PHPmailerCrayon-v">HostCrayon-h"> Crayon-o">=Crayon-h"> Crayon-s">'smtp.gmail.com'Crayon-sy">;Crayon-h">Crayon-c">// SMTP服务器地址，在邮件设置或者帮助中心可以找到

Crayon-line Crayon-striped-line" id="Crayon-5c891d512a82f630727518-8">Crayon-h">Crayon-sy">$Crayon-v">PHPmailerCrayon-v">UsernameCrayon-h"> Crayon-o">=Crayon-h"> Crayon-s">'****@****.com'Crayon-sy">;Crayon-h"> Crayon-c">// 您的邮件地址

Crayon-line" id="Crayon-5c891d512a82f630727518-9">Crayon-h">Crayon-sy">$Crayon-v">PHPmailerCrayon-v">PasswordCrayon-h"> Crayon-o">=Crayon-h"> Crayon-s">'*********'Crayon-sy">;Crayon-h"> Crayon-c">// 你的邮箱登陆密码

Crayon-line Crayon-striped-line" id="Crayon-5c891d512a82f630727518-10">Crayon-sy">}

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Crayon-line Crayon-striped-line" id="Crayon-5c891d512a82f630727518-12">Crayon-e">add_actionCrayon-sy">(Crayon-s">'PHPmailer_init'Crayon-sy">,Crayon-h"> Crayon-s">'mail_smtp'Crayon-sy">)Crayon-sy">;

SMTP 邮件发送