Integrate auto-updating email domain block feed (e.g., fakefilter)

[NeilHanlon]

Summary

Integrate an automated system to periodically fetch, deduplicate, and block email domains from externally maintained lists (such as fakefilter) for moderation and anti-abuse purposes.

Details

• Implement a configurable timer to regularly fetch domain blocklists from one or more sources (URL endpoints).
• Support configuring multiple feed URLs (e.g., fakefilter and others).
• Automatically deduplicate domains when merging lists.
• Update the blocklist used by the plugin without manual intervention.
• Ensure that blocked domains are enforced in Mattermost (e.g., for user registration, messaging, etc.).
• Provide configuration options for:
  • Update frequency (e.g., every X hours/days)
  • List of feed URLs
  • Last updated timestamp
  • Option to manually trigger an update
  • Logging of update and blocking events
• Consider error handling for failed fetches or malformed lists.

References

• fakefilter

Motivation

Helps automate and improve moderation by leveraging trusted third-party blocklists, reducing manual maintenance and improving anti-abuse capabilities.

Acceptance Criteria

• Configurable timer for fetching domain lists
• Multiple feed URL support
• Deduplication logic
• Automatic update and enforcement of blocklist
• Admin configuration UI for the above features
• Logging and error handling