Upgrading from v0.10.x to v0.11.0

Version 0.11.0 introduces breaking changes to the spam filter configuration. Although no data migration is required, if changes were made to the previous spam filter, the configuration of the new spam filter should be reviewed. In particular:

• lookup.spam-* settings are no longer used, these have been replaced by spam-filter.* settings. Review the updated documentation.
• Previous spam-filter and track-replies Sieve scripts cannot be used with the new version. They have been replaced by a built-in spam filter written in Rust.
• Cache settings have changed, see the documentation for details.
• Support for Pipes was removed in favor of MTA hooks and Milter.
• config.resource.spam-filter is now spam-filter.resource.
• config.resource.webadmin is now webadmin.resource.
• authentication.rate-limit was removed as security is handled by fail2ban.