WordPress中wp_mail邮件发送异常问题求助

Hey Kevin, let's work through each of your email issues step by step—most of these are tied to a missing function that's corrupting your email headers, plus small code inconsistencies. Here's how to fix everything:

1. Fix the Missing wpb_sender_email Warning (Root Cause of Most Issues) #

That PHP warning is the big culprit here. WordPress is trying to run a function called wpb_sender_email (probably from a filter hook in your theme or a custom plugin) that doesn't exist. This messes up your email headers, causing weird formatting like the sender showing up in the subject line.

To fix this:

• Check your theme's functions.php file or any custom plugins for lines like this:

  add_filter( 'wp_mail_from', 'wpb_sender_email' );
  add_filter( 'wp_mail_from_name', 'wpb_sender_name' );
  

• Option 1: Remove those lines if you don't need custom sender settings.
• Option 2: Define the missing functions to make the hooks work properly:

  function wpb_sender_email( $original_email ) {
      return 'kevin@warenghem.com';
  }
  function wpb_sender_name( $original_name ) {
      return 'Kevin Brosseau';
  }
  

2. Fix Subject/From Display & HTML Formatting Issues #

Your current code has two problems causing formatting bugs:

• You're using HTML entities (<, >) instead of raw HTML tags in your email body—this makes email clients render them as text instead of parsing them as HTML.
• You didn't include code to actually receive and parse the incoming JSON data (so $email is undefined, which breaks the $to variable).

Update your email content and add JSON handling:

// Add this at the top to receive and validate JSON input
$json_data = file_get_contents('php://input');
$data = json_decode($json_data, true);

// Get and validate the email address
$email = $data['email'] ?? '';
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    http_response_code(400);
    echo json_encode(['status' => 'error', 'message' => 'Invalid email address']);
    exit;
}

// Fix the HTML body (use raw tags, not entities)
$body = '<html><body><h1>Hello World!</h1></body></html>';

3. Fix Email Delivery Problems #

Delivery issues usually stem from one of three things:

• Invalid recipient emails: The validation step above will prevent sending to bad addresses.
• Server mail configuration: Many shared hosts restrict PHP's built-in mail() function (which wp_mail uses by default). Ask your host if mail() is enabled, or switch to SMTP for more reliable delivery (you can use a plugin like WP Mail SMTP, or add SMTP settings via code).
• DNS records: Make sure your domain has valid SPF and DKIM records set up—these tell email providers your messages are legitimate and not spam.

Full Corrected Code #

Here's the complete, fixed version of your script with all the changes above:

// Prevent loading WordPress themes
define('WP_USE_THEMES', false);

// Load WordPress Core (simplified path—adjust if your script is in a different folder)
require_once(dirname(__DIR__) . '/wp-load.php');

// Receive and parse incoming JSON
$json_data = file_get_contents('php://input');
$data = json_decode($json_data, true);

// Validate email address
$email = $data['email'] ?? '';
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    http_response_code(400);
    echo json_encode(['status' => 'error', 'message' => 'Invalid email address']);
    exit;
}

// Define sender functions to fix the hook warning
function wpb_sender_email( $original_email ) {
    return 'kevin@warenghem.com';
}
function wpb_sender_name( $original_name ) {
    return 'Kevin Brosseau';
}
add_filter('wp_mail_from', 'wpb_sender_email');
add_filter('wp_mail_from_name', 'wpb_sender_name');

// Email settings
$to = $email;
$subject = 'Arbre planté';
$body = '<html><body><h1>Hello World!</h1></body></html>';
$headers = [
    'Content-Type: text/html; charset=UTF-8',
    'From: Kevin Brosseau <kevin@warenghem.com>'
];

// Send email and return status
$mail_sent = wp_mail($to, $subject, $body, $headers);

if ($mail_sent) {
    echo json_encode(['status' => 'success', 'message' => 'Email sent successfully']);
} else {
    http_response_code(500);
    echo json_encode(['status' => 'error', 'message' => 'Failed to send email']);
}

Give this a shot—most of your issues should disappear once the missing function is fixed and the HTML/JSON handling is corrected. For persistent delivery problems, checking your host's mail settings and DNS records is the next step.

内容的提问来源于stack exchange，提问作者Kevin