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* Support for Django 4.0. Thanks domdinicola!
* `cleanup_mail` now deletes emails in batches, which is much nicer to DB when deleting millions of emails. Thanks stevemc4!
* Failure to send an email are now logged as an exception. Thanks SaturnFromTitan!
* Added `es` locale. Thanks ahmontero!
* Fixed admin template discovery issue for case-sensitive filesystems. Thanks fasih!
* Fixes: `SMTPServerDisconnected` error. Thanks weimens!
* Various maintenance work by jrief and mogost.