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Handful of fixes for inbound email handling

Nicolas Dandrimont requested to merge mr/inbound-email-fixes into master
  • inbound_email: extend the list of headers accepted for email destinations (and add test)
  • inbound_email: restore support for sha1-based signed addresses
  • settings: ensure that the production secret key does not match the development default
  • config: add support for SECRET_KEY_FALLBACKS

After the migration to Django 4, the signature algorithm for signed addresses was upgraded to sha256. However, sha1-based addresses still exist in the wild, so we need to keep supporting them.

SECRET_KEY_FALLBACKS, which was introduced in recent Django versions, will allow us to rotate the secret key when needed. Explicit support for this feature is needed in our inbound email handler.

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