How Kavik verifies specific providers

Provider-specific verification strategies for Gmail, Outlook, Yahoo, Apple, Proton, Zoho and European ISPs, and what the verdicts mean for each.

Generic SMTP probing misreads most large providers: some accept everything, some tarpit, some answer only to their own APIs. Kavik keeps a dedicated strategy per provider family, tuned against live behavior and updated as providers change.

Pick a provider to see how verification works there and what each verdict means: