Collection: email
Type: ip  Subtype: smtp_servers
Slug: email_smtp_servers_ip

IP addresses of known email SMTP servers (legitimate senders infrastructure).

File format
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  ip_<list_type>.txt          — one entry per line
  ip_<list_type>_metadata.txt — entry # created_date expire_date public_reference
  lastupdated                             — ISO 8601 timestamp of last dump

List types: blocklist, allowlist, suspected

Differentials
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  differentials/YYYY/MM/DD/<file>.txt  — per-day '+ added' / '- removed' diff
  differentials/YYYY/MM/<file>.txt     — monthly net-change diff
  Files are generated lazily on first HTTP request and cached on disk.