Check to check if wp_mail is working properly?

I’m trying to use wp_mail (testing on local machine) but no mail is received.
The php.ini has smtp_port = 25 set and the php mail() is working so far.

• how can I check if wp_mail is working
• what can fail

Here is the code of my mail function:

function mv_optin_mail($id, $data){

    $url = $id."-".mv_mail_token($id, $data['token']);

    add_filter( 'wp_mail_content_type', 'set_html_content_type' );
    add_filter( 'wp_mail_charset', 'utf8' );

    $headers[] = 'From: '.sender_signature.' <'.noreply_address.'>';    

    ob_start();
    include("optin-mail.php");
    $html_mail = ob_get_contents();
    ob_end_clean();

    wp_mail( $data['email'], 'Some Subject', $html_mail, $headers );
    remove_filter( 'wp_mail_content_type', 'set_html_content_type' );
    remove_filter( 'wp_mail_charset', 'utf8' );
}

I don’t get any errors. Is there a way to toggle error-loggin for wordpress?

The noreply_address is noreply@root

WordPress relies on the PHPMailer class to send email through PHP’s mail function.

Since PHP’s mail function returns very little information after execution (only TRUE or FALSE), I suggest temporarily stripping down your mv_optin_mail function to a minimum in order to see if the wp_mail functions works.

Example:

$mailResult = false;
$mailResult = wp_mail( 'youremail@bla.com', 'test if mail works', 'hurray' );
echo $mailResult;

Since you’ve tested PHP’s mail function already, the mail should arrive.

If it does not, the problem lies in the other statements of your function or in the PHPMailer class.

In cases like this, I usually rename my function to something like:

function mv_optin_mail_backup( $id, $data ) {

And add a temporary function with the same name to mess around with like so:

function mv_optin_mail( $id, $data ) {
    $mailResult = false;
    $mailResult = wp_mail( 'youremail@bla.com', 'test if mail works', 'hurray' );
    echo $mailResult;
}

When I have figured out what the problem is, I start using the backup version again.

To send a mail using PHPMailer directly you can do something like this (not for production, just for debugging):

add_action( 'phpmailer_init', 'my_phpmailer_example' );
function my_phpmailer_example( $phpmailer ) {
    $phpmailer->isSMTP();
    //$phpmailer->Host="smtp.example.com";
    //    $phpmailer->SMTPAuth = true; // Force it to use Username and Password to authenticate
    $phpmailer->Port = 25;
    //    $phpmailer->Username="yourusername";
    //    $phpmailer->Password = 'yourpassword';

    // Additional settings…
    //$phpmailer->SMTPSecure = "tls"; // Choose SSL or TLS, if necessary for your server
    $phpmailer->setFrom( "fromemail@bla.com", "From Name" );
    $phpmailer->addAddress( "youremail@bla.com", "Your name" );
    $phpmailer->Subject    = "Testing PHPMailer";           
    $phpmailer->Body     = "Hurray! \n\n Great.";
    if( !$phpmailer->send() ) {
        echo "Mailer Error: " . $phpmailer->ErrorInfo;
    } else {
        echo "Message sent!";
    }                       

}