Not receiving email of my contact us form from my website

<?php
if(isset($_POST['email'])) {
     
    // CHANGE THE TWO LINES BELOW
    $email_to = "[email protected]";
     
    $email_subject = "Thanks for visiting us";
     
     
    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }
     
    // validation expected data exists
    if(!isset($_POST['first_name']) ||
        !isset($_POST['last_name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['telephone']) ||
        !isset($_POST['comments'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }
     
    $first_name = $_POST['first_name']; // required
    $last_name = $_POST['last_name']; // required
    $email_from = $_POST['email']; // required
    $telephone = $_POST['telephone']; // not required
    $comments = $_POST['comments']; // required
     
    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-][email protected][A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
    $string_exp = "/^[A-Za-z .'-]+$/";
  if(!preg_match($string_exp,$first_name)) {
    $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$last_name)) {
    $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
  }
  if(strlen($comments) < 2) {
    $error_message .= 'The Comments you entered do not appear to be valid.<br />';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Form details below.\n\n";
     
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }
     
    $email_message .= "First Name: ".clean_string($first_name)."\n";
    $email_message .= "Last Name: ".clean_string($last_name)."\n";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Telephone: ".clean_string($telephone)."\n";
    $email_message .= "Comments: ".clean_string($comments)."\n";
     
     
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
?>
 
<!-- place your own success html below -->
 
Thank you for contacting us. We will be in touch with you very soon.
 
<?php
}
die();
?>

<?php 
// Email configuration 
$toEmail = '[email protected]'; 
$fromName = 'Sender Name'; 
$formEmail = '[email protected]'; 
 
$postData = $statusMsg = $valErr = ''; 
$status = 'error'; 
 
// If the form is submitted 
if(isset($_POST['submit'])){ 
    // Get the submitted form data 
    $postData = $_POST; 
    $name = trim($_POST['name']); 
    $email = trim($_POST['email']); 
    $subject = trim($_POST['subject']); 
    $message = trim($_POST['message']); 
     
    // Validate form fields 
    if(empty($name)){ 
         $valErr .= 'Please enter your name.<br/>'; 
    } 
    if(empty($email) || filter_var($email, FILTER_VALIDATE_EMAIL) === false){ 
        $valErr .= 'Please enter a valid email.<br/>'; 
    } 
    if(empty($subject)){ 
        $valErr .= 'Please enter subject.<br/>'; 
    } 
    if(empty($message)){ 
        $valErr .= 'Please enter your message.<br/>'; 
    } 
     
    if(empty($valErr)){ 
        // Send email notification to the site admin 
        $subject = 'New contact request submitted'; 
        $htmlContent = " 
            <h2>Contact Request Details</h2> 
            <p><b>Name: </b>".$name."</p> 
            <p><b>Email: </b>".$email."</p> 
            <p><b>Subject: </b>".$subject."</p> 
            <p><b>Message: </b>".$message."</p> 
        "; 
         
        // Always set content-type when sending HTML email 
        $headers = "MIME-Version: 1.0" . "\r\n"; 
        $headers .= "Content-type:text/html;charset=UTF-8" . "\r\n"; 
        // Header for sender info 
        $headers .= 'From:'.$fromName.' <'.$formEmail.'>' . "\r\n"; 
         
        // Send email 
        @mail($toEmail, $subject, $htmlContent, $headers); 
         
        $status = 'success'; 
        $statusMsg = 'Thank you! Your contact request has submitted successfully, we will get back to you soon.'; 
        $postData = ''; 
    }else{ 
        $statusMsg = '<p>Please fill all the mandatory fields:</p>'.trim($valErr, '<br/>'); 
    } 
}
?>

also tried below code but both are not working

<?php
if(isset($_POST['email'])) {
     
    // CHANGE THE TWO LINES BELOW
    $email_to = "[email protected]";
     
    $email_subject = "Thanks for visiting us";
     
     
    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }
     
    // validation expected data exists
    if(!isset($_POST['first_name']) ||
        !isset($_POST['last_name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['telephone']) ||
        !isset($_POST['comments'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }
     
    $first_name = $_POST['first_name']; // required
    $last_name = $_POST['last_name']; // required
    $email_from = $_POST['email']; // required
    $telephone = $_POST['telephone']; // not required
    $comments = $_POST['comments']; // required
     
    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-][email protected][A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
    $string_exp = "/^[A-Za-z .'-]+$/";
  if(!preg_match($string_exp,$first_name)) {
    $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$last_name)) {
    $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
  }
  if(strlen($comments) < 2) {
    $error_message .= 'The Comments you entered do not appear to be valid.<br />';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Form details below.\n\n";
     
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }
     
    $email_message .= "First Name: ".clean_string($first_name)."\n";
    $email_message .= "Last Name: ".clean_string($last_name)."\n";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Telephone: ".clean_string($telephone)."\n";
    $email_message .= "Comments: ".clean_string($comments)."\n";
     
     
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
?>
 
<!-- place your own success html below -->
 
Thank you for contacting us. We will be in touch with you very soon.
 
<?php
}
die();
?>

Your first post in this thread contains two different sets of code. The second post in this thread is the same as the first set of code in the first post, but with a different $email_to value. If this is not what you intended, please edit your posts.

As to the code itself. Just trying a bunch of different code you find on the web is not programming. All you are doing is repeating bad code that someone else posted, who are usually more interested in the search engine rank and ad revenue, than in code that is secure, provides a good user experience, is simple, and though validation and error handling logic will either work or it will tell you why it doesn’t work.

There’s not much worth keeping from either set of code, and they both contain two problems that are likely keeping them from working and telling you why they don’t work. Of the two sets of code, the second set of code in the first post is the best to continue with.

First, these emails are NOT being sent from the email address that you are using in the code. For the first set of code in the first post and in the code in second post, these emails are not being sent from the email address that was entered in the form. For the second set of code in the first post, these emails are not being sent from the hard-code value in $formEmail, unless you altered the value when posting, in which case you should have clearly indicated so in the post. The From: email address must correspond to the mail server at your web hosting.

Second, both sets of code are using the @ error suppressor on the mail() call, which will prevent the display/logging of any php error from the mail() call that would help you find why the emails are not being sent. After removing the @ error suppressor, you should have logic that tests the return value from the mail() call. For a true value, you would setup and display the success message. For a false value, you would display a failure message and log all the relevant information about the mail parameters so that you can see if there’s something about the data that’s causing the mail call to fail.

Lastly, just telling us that code didn’t work is pointless. It did something when you tried to execute it, even if it resulted in a blank page. You must tell us what exactly it did do. Also, during your testing, using empty, invalided, and valid values for each field, did the correct error messages get produced?

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