Free email
P0 — public mailboxes → personal
SPF
P1.5 — token extraction, cache
HTTP
P3 — provider patterns, fan-out
Office 365
P3.5 — realm rescue (Managed/federated)
Exchange
P3.6 — on-prem/hybrid EWS autodiscover
Region
P4 — TLD → bucket fallback
Mail servers
Mailbox import autodetect
Industry
Homepage+LLM, Apify, pace