* There's no support for more than one Mailgun mail server.

* Automate more webhook registration. It would be nice to not have to click the
  "Unregister Mailgun webhooks" and "Register Mailgun webhooks" when setting up
  Mailgun in Odoo. However, it doesn't come without its `conceptual complexities
  <https://github.com/OCA/social/pull/787#discussion_r734275262>`__.