Nginx gives 405 not allowed error on php contacform - opensuse leap 15

Question

I'm trying to get my webpage send out email from the contact form. Page is simple, made in html and added an php contact form.

This is installed on a opensuse leap 15 server, with nginx and php8 installed.

When trying to send from contact form I get

405 Not Allowed

---

nginx/1.21.5

I have tried to figure out how I can get the php form to allow me on opensuse. From what I see there is not any phpmailer packages for opensuse, like it is for other distroes (Used that on centos before changing to opensuse)

My php mailer file.

<?php
if ($_POST) {
    $to = 'emailaddress';
    $name = $_POST['name'];
    $email = $_POST['email'];
    $header = $_POST['header'];
    $message = $_POST['message'];
    $mes = "Navn: $name \nE-post: $email \nEmne: $header \nMelding: $message";
    if ($mes) {
        mail($to, $header, $mes, "Content-type:text/plain; charset = UTF-8\r\nFrom:$email");
    }
} else {
    header('Location: /');
    exit;
}

And this is the html codes for the form

<div id="contact_us" class="modal fade modal-contact-us" role="dialog">
        <div class="modal-dialog">
          <!-- Modal content-->
          <div class="modal-content">
            <div class="modal-header-contact">
              <h4 class="text-capitalize fwSemi-bold">Contact us</h4>

              <span class="close" data-dismiss="modal"></span>
            </div>

            <div class="model-body-contact">
              <form
                action="mailer.php"
                class="needs-validation"
                novalidate
              >

                <div class="control-container">
                  <label class="fwbold" for="modal-contact-name">Name *</label>
                  <input
                    class="form-control"
                    type="text"
                    id="modal-contact-name"
                    required
                    name="name"
                    minlength="2"
                  />
                </div>

                <div class="control-container">
                  <label class="fwbold" for="modal-contact-email"
                    >Email *</label
>
                  <input
                    class="form-control"
                    type="text"
                    id="modal-contact-email"
                    required
                    pattern="^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$"
                    name="email"
                  />
                </div>

                <div class="control-container">
                  <label class="fwbold" for="modal-contact-phone">Phone</label>
                  <input
                    class="form-control"
                    type="text"
                    id="modal-contact-phone"
                    pattern="^[0-9]+$"
                  />
                </div>

                <div class="control-container">
                  <label class="fwbold" for="modal-contact-message"
                    >Melding</label
                  >
                  <textarea
                    id="modal-contact-message"
                    name="message"
                  ></textarea>
                </div>

                <input
                  type="text"
                  class="hidden"
                  name="header"
                  value="Question"
                />

                <!--                                                    <input type="text" class="hidden" name="FM_ContactForm[receipient]" value="mailaddress">-->
                <!--                                                    <input type="text" class="hidden" name="FM_ContactForm[sentFrom]" value="">-->
                <!--                                                    <input type="text" class="hidden" name="ua" value="1">-->
                <!--                                                    <input type="text" class="hidden" name="id" value="33">-->
                <!--                                                    <input type="text" class="hidden" name="action" value="Contact">-->
                <!--                                                    <input type="text" class="hidden" name="blockId" value="">-->

                <div class="modal-contact-us-actions">
                  <button
                    class="btn btn-link round cancel-btn"
                                        type="button"
                    data-dismiss="modal"
                  >
                    Avbryt
                  </button>
                  <button
                    class="btn-primary btn-blue md-round fwSemi-bold send-btn"
                    type="submit"
                  >
                    Send
                  </button>
                </div>
              </form>
            </div>
          </div>
        </div>
      </div>

Tried to install sendmail instead of postfix to see if that helps, turned off firewall, tried to find phpmailer for opensuse distro