About InboxAudit
InboxAudit checks the DNS records that decide whether your mail reaches an inbox: SPF, DKIM, DMARC, MX and BIMI.
What makes it different
Most free SPF checkers validate syntax. That misses the failure that actually breaks mail:
the ten-lookup limit. Counting it means
recursively resolving every include:, a, mx,
exists and redirect= in the chain, which is work most tools skip. This
one does it on every check.
The same applies to the provider reference. Every include: value on this site was
resolved against live DNS before publication, and any that did not return a real SPF record was
dropped rather than guessed. Publishing a wrong include breaks the reader's mail.
What it cannot tell you
DKIM selectors cannot be enumerated from DNS. The checker probes selectors that common providers use, so a hit proves DKIM is configured while a miss proves nothing — the reason why.
Privacy
Checks run against public DNS. Nothing you enter is stored, logged to a database, or shared. See the privacy policy.