### Security
- OStatus: eliminate the possibility of a protocol downgrade attack.
- OStatus: prevent following locked accounts, bypassing the approval process.
-– ActivityPub: Do not check if actor is active when deleting a user
### Changed
- **Breaking:** Configuration: A setting to explicitly disable the mailer was added, defaulting to true, if you are using a mailer add `config :pleroma, Pleroma.Emails.Mailer, enabled: true` to your config
- Invalid SemVer version generation, when the current branch does not have commits ahead of tag/checked out on a tag
- Pleroma.Upload base_url was not automatically whitelisted by MediaProxy. Now your custom CDN or file hosting will be accessed directly as expected.
- Report email not being sent to admins when the reporter is a remote user
+- ActivityPub: Deactivated user deletion
### Added
- MRF: Support for priming the mediaproxy cache (`Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy`)