app-MAIL-temp/templates/dashboard/delete_account.html

{% extends "default.html" %}

{% set active_page = "setting" %}
{% block title %}Delete account{% endblock %}
{% block default_content %}

  <div class="card">
    <div class="card-body">
      <div class="h2">Account Deletion</div>
      <div class="my-3 alert alert-warning">
        Once an account is deleted, it can't be restored.
        All its records (aliases, domains, settings, etc.) are immediately deleted.
      </div>
      <form method="post">
        <input type="hidden" name="form-name" value="delete-account">
        {{ delete_form.csrf_token }}
        <span class="delete-account btn btn-outline-danger">Delete account</span>
      </form>
    </div>
  </div>
{% endblock %}
{% block script %}

  <script>
    $(".delete-account").on("click", function (e) {
      let that = $(this);

      bootbox.confirm({
        message: "All your data including your aliases will be deleted, " +
          "other people might not be able to reach you after, " +
          " please confirm.",
        buttons: {
          confirm: {
            label: 'Yes, delete my account',
            className: 'btn-danger'
          },
          cancel: {
            label: 'Cancel',
            className: 'btn-outline-primary'
          }
        },
        callback: function (result) {
          if (result) {
            that.closest("form").submit();
          }
        }
      })

    });
  </script>
{% endblock %}