### 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