php - MIME format form not processing attachment -


i've got contact form running plugin on wordpress site built recently, processes email body , attachment in mime-type format. when tested form in email clients -- inbox , gmail -- received email formatted: body copy attachment.

however, client reported incoming emails form displaying code, in particular mime notice , content boundaries instead of attachment, in both gmail , office 365. deliver mail function can found below. idea i'm doing wrong?

thanks in advance!!

function deliver_mail() {  if ( isset( $_post['w-submitted'] ) ) {     $first_name = sanitize_text_field( $_post['m-first-name'] );     $last_name = sanitize_text_field( $_post['m-last-name'] );     $contact_number = sanitize_text_field( $_post['m-contact-number'] );     $email = sanitize_email( $_post['m-email-address'] );     if(isset($_post['m-current-location'])) {         $current_location = $_post['m-current-location'];     }     $current_position = sanitize_text_field( $_post['m-current-position'] );     $city = sanitize_text_field( $_post['m-city'] );     $years_experience = sanitize_text_field( $_post['m-experience-years'] );     $qualifications = sanitize_text_field( $_post['m-qualifications'] );     if(isset($_post['m-position'])) {         $position = $_post['m-position'];     }             $other_position = $_post['m-other-position'];     if(isset($_post['m-applied-location'])) {         $applied_location = $_post['m-applied-location'];     }     $expected_salary = sanitize_text_field( $_post['m-expected-salary'] );     $availability = sanitize_text_field( $_post['m-availability'] );     $referral_source = sanitize_text_field( $_post['m-referral-source'] );     if(isset($_files['m-upload-resume']['tmp_name'])) {         $attachment = chunk_split(base64_encode(file_get_contents($_files['m-upload-resume']['tmp_name'])));         $filename = $_files['m-upload-resume']['name'];     }      $boundary =md5(date('r', time()));      $to = get_option( 'admin_email' );      $subject = "job applicant: $first_name $last_name";      $headers = "from: $first_name $last_name <$email>" . "\r\n";      $message = "first name: $first_name \r\nlast name: $last_name   \r\ncontact number: $contact_number \r\ncurrent country: $current_location \r\ncurrent position: $current_position \r\ncity: $city \r\nyears experience: $years_experience \r\nqualifications: $qualifications \r\ndesired position: $position \r\nother position: $other_position \r\nexpected salary: $expected_salary \r\navailability: $availability \r\nreferral source: $referral_source";      $headers .= "\r\nmime-version: 1.0\r\ncontent-type: multipart/mixed; boundary=\"_1_$boundary\"";      $message = "this multi-part message in mime format.  --_1_$boundary content-type: multipart/alternative; boundary=\"_2_$boundary\"  --_2_$boundary content-type: text/plain; charset=\"utf-8\" content-transfer-encoding: 7bit  $message  --_2_$boundary-- --_1_$boundary content-type: application/octet-stream; name=\"$filename\" content-transfer-encoding: base64 content-disposition: attachment  $attachment --_1_$boundary--";      // if email has been processed sending, display success message     if ( wp_mail( $to, $subject, $message, $headers  ) ) {         echo '<div id="contact-response">';         echo '<p>thank interest in joining our team. forward reviewing application.</p>';         echo '</div>';     } else {         echo 'sorry, unexpected error occurred. please refresh page , try again.';     } }  } 


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