sendContact.php

<?php

    use PHPMailer\PHPMailer\PHPMailer;
    use PHPMailer\PHPMailer\Exception;

    require('PHPMailer/src/PHPMailer.php');
    require('PHPMailer/src/SMTP.php');
    require('PHPMailer/src/Exception.php');

    $mail = new PHPMailer();

    // Server settings
    $mail -> SMTPDebug = 0;
    $mail -> IsSMTP();
    $mail -> Mailer = "SMTP";
    $mail -> Host = "smtp.office365.com";
    $mail -> SMTPAuth = true;
    $mail -> Username = "info@MyWebsite.com";
    $mail -> Password = "Secret";
    $mail -> SMTPSecure = "STARTTLS";
    $mail -> Port = 587;


    // Recipient
    $mail -> setFrom($_POST["ContactsEmail"], $_POST["ContactsName"]);
    $mail -> AddReplyTo($_POST["ContactsEmail"], $_POST["ContactsName"]);
    $mail -> addAddress("info@MyWebsite.com");
    $mail -> Subject = "Contact Form - www.MyWebsite.com";
    $mail -> WordWrap = 80;
    $mail -> Body = "
        <b>Name:</b> {$_POST['ContactsName']}<br />
        <b>Email:</b> {$_POST['ContactsEmail']}<br />
        <b>Phone:</b> {$_POST['ContactsPhone']}<br />
        <b>Company:</b> {$_POST['ContactsCompany']}<br />
        <b>Message:</b> {$_POST['ContactsMessage']}<br />
        <b>Image:</b> {$ContactsFile}
    ";

    if(!empty($_FILES["ContactsFile"]["name"])) {

        foreach($_FILES["ContactsFile"]["name"] as $k => $v) {

            $fileType = mime_content_type($_FILES["ContactsFile"]["name"]); // Get file (mime) extention/type

            $allowedTypes = array('image/jpeg', 'image/png', 'image/gif', 'image/tiff', 'application/pdf'); // Make an array of the allowed extentions (mime types)

            if(in_array($fileType, $allowedTypes)) {

                $ContactsFile = 'CHECK FILE';

                $mail -> AddAttachment($_FILES["ContactsFile"]["tmp_name"][$k], $_FILES["ContactsFile"]["name"][$k]);

            } else {
                $ContactError = 'Only .JPEG/.JPG, .PNG, .GIF, .TIFF/.TIF and .PDF files are accepted';
                $ContactError = '123';
            }

        }

    } else {
        $ContactsFile = 'NO IMAGE';
    }

    $mail -> IsHTML(true);

    if($mail -> Send()) {

        echo "
            <span class='ContactSuccess'>
                <span class='SendContainer'>
                    <div class='mdi mdi-check-circle'></div>
                    your message was sent
                </span>
            </span>
        ";

    } else {

        echo "
            <span class='ContactError'>
                <span class='SendContainer'>
                    <div class='mdi mdi-alert-circle'></div>
                    there was a problem sending your message
                    <div class='ContactErrorMessage'>
                        " . $ContactError . "
                    </div>
                </span>
            </span>
        ";
        echo $mail -> ErrorInfo;
    }

?>