Free Toolkit
Inbox Placement Estimator
Estimate your inbox placement at Gmail, Outlook, Yahoo, and Apple Mail — based on DNS authentication signals and optional subject line analysis.
4 Major Providers
Gmail, Outlook, Yahoo, and Apple Mail — scored individually based on how each provider weighs different signals.
DNS + Subject
SPF, DMARC, PTR, blacklists, and BIMI checked via live DNS. Optionally test your subject line for spam triggers.
Prioritised by provider
Each provider card shows its top issues so you know which fix matters most for that specific inbox.
Want real seed-list inbox testing?
Estimates are a starting point. Mailflo gives you real inbox placement data from seed accounts at every major provider — so you know before you send.
See Mailflo plans