修改配置文件mail-local.php

‘mailer‘ => [
    ‘class‘ => ‘yii\swiftmailer\Mailer‘,
    ‘useFileTransport‘ =>false,//这句一定有，false发送邮件，true只是生成邮件在runtime文件夹下，不发邮件
    ‘transport‘ => [
        ‘class‘ => ‘Swift_SmtpTransport‘,
        ‘host‘ => ‘smtp.163.com‘,  //每种邮箱的host配置不一样
        ‘username‘ => ‘y982044126‘,
        ‘password‘ => ‘shx1996‘,
        ‘port‘ => ‘25‘,
        ‘encryption‘ => ‘tls‘,
    ],
    ‘messageConfig‘=>[
        ‘charset‘=>‘UTF-8‘,
        ‘from‘=>[‘y982044126@163.com‘=>‘admin‘]
    ],
],

控制器页面

$email=\yii::$app->request->get(‘email‘);   //接收要发送的邮箱
$mail= Yii::$app->mailer->compose();
$mail->setTo("$email");
$mail->setSubject("邮件测试");
//$mail->setTextBody(‘zheshisha ‘);   //发布纯文字文本
$mail->setHtmlBody("恭喜你，邮箱已通过验证！);    //发布可以带html标签的文本
if($mail->send())
    echo "success";
else
    echo "failse";
die();

yii2 邮件发送