• Remove servers failing beyond threshold.
• Preserve user‑pinned servers.

• Minimize metadata sent when checking servers; prefer passive checks (local TCP connects) over active status calls to source providers.
• Avoid leaking client identifiers or IPs to list providers. If making HTTP requests, do not include unique client IDs; use standard User‑Agent only.
• Allow an option to fetch lists via user‑provided proxies or Tor for privacy‑conscious users.

• Enable/disable auto‑update.
• Add/remove/update source URLs.
• Update frequency and backoff policy.
• Merge vs replace behavior.
• Trust and verification settings (require HTTPS/GPG).
• Max list size and pruning age.

Beyond simple connectivity issues, failing to update your server list poses security risks. emule server list auto update

Keeping Your eMule Connected: The Definitive Guide to Auto-Updating Server Lists Technical Analysis: Mechanisms and Security of eMule Server