有几种可能性:

您正面临服务器问题。服务器上没有邮件服务器。所以你的邮件不能工作，因为你的代码是好的，邮件是有类型的。 您没有得到发布的值。尝试使用静态值的代码。 使用SMTP邮件发送邮件…

你可以使用PHPMailer，它工作得很完美，这里有一个代码示例:

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/phpmailer/phpmailer/src/Exception.php';
require 'vendor/phpmailer/phpmailer/src/PHPMailer.php';
require 'vendor/phpmailer/phpmailer/src/SMTP.php';
$editor = $_POST["editor"];
$subject = $_POST["subject"];
$to = $_POST["to"];

try {

    if ($_SERVER["REQUEST_METHOD"] == "POST") {

        $mail = new PHPMailer();
        $mail->IsSMTP();
        $mail->Mailer = "smtp";
        $mail->SMTPDebug  = 1;
        $mail->SMTPAuth   = TRUE;
        $mail->SMTPSecure = "tls";
        $mail->Port       = 587;
        $mail->Host       = "smtp.gmail.com";//using smtp server
        $mail->Username   = "XXXXXXXXXX@gmail.com";//the email which will send the email 
        $mail->Password   = "XXXXXXXXXX";//the password

        $mail->IsHTML(true);
        $mail->AddAddress($to, "recipient-name");
        $mail->SetFrom("XXXXXXXXXX@gmail.com", "from-name");
        $mail->AddReplyTo("XXXXXXXXXX@gmail.com", "reply-to-name");
        $mail->Subject = $subject;
        $mail->MsgHTML($editor);




        if (!$mail->Send()) {
            echo "Error while sending Email.";
            var_dump($mail);
        } else {
            echo "Email sent successfully";
        }
    }
} catch (Exception $e) {
    echo $e->getMessage();
}

我在000webhost上做了以下工作:

$headers  = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1" . "\r\n";
$headers .= "From: ". $from. "\r\n";
$headers .= "Reply-To: ". $from. "\r\n";
$headers .= "X-Mailer: PHP/" . phpversion();
$headers .= "X-Priority: 1" . "\r\n";

发送邮件时直接输入邮箱地址:

mail('email@gmail.com', $subject, $message, $headers)

使用“and not”。

这个代码工作，但电子邮件收到了半小时的延迟。

把这两件事分开和一起尝试:

删除if($_POST['submit']){} 移除$from(只是我的直觉)

Debian 10.0.0 ('Buster')的Sendmail安装实际上很简单!

php . ini

[mail function]
sendmail_path=/usr/sbin/sendmail -t -i
; (Other directives are mostly windows)

标准sendmail包安装(允许'send'):

su -                                        # Install as user 'root'
dpkg --list                                 # Is install necessary?
apt-get install sendmail sendmail-cf m4     # Note multiple package selection
sendmailconfig                              # Respond all 'Y' for new install

其他有用的命令:

which sendmail                              # /usr/sbin/sendmail
which sendmailconfig                        # /usr/sbin/sendmailconfig
man sendmail                                # Documentation
systemctl restart sendmail                  # As and when required

验证(发送能力)

echo "Subject: sendmail test" | sendmail -v <yourEmail>@gmail.com

以上花费了大约5分钟。然后我浪费了5个小时…别忘了检查你的垃圾邮件文件夹!

我觉得这个应该能搞定。我只是添加了一个if(isset，并在主体中的变量中添加了连接，以将PHP与HTML分开。

<?php
    $name = $_POST['name'];
    $email = $_POST['email'];
    $message = $_POST['message'];
    $from = 'From: yoursite.com'; 
    $to = 'contact@yoursite.com'; 
    $subject = 'Customer Inquiry';
    $body = "From:" .$name."\r\n E-Mail:" .$email."\r\n Message:\r\n" .$message;

if (isset($_POST['submit'])) 
{
    if (mail ($to, $subject, $body, $from)) 
    { 
        echo '<p>Your message has been sent!</p>';
    } 
    else 
    { 
        echo '<p>Something went wrong, go back and try again!</p>'; 
    }
}

?>