Send a test email: will Gmail, Yahoo and Outlook accept it?
Get a one-time address, send any email to it from the account or app you want to test, and see in seconds whether SPF, DKIM and DMARC pass, the sending server has reverse DNS, and marketing mail has one-click unsubscribe.
FreeNo sign-upBody never storedResults kept 7 days
What it checks
SPF
Is the server that sent it allowed by your envelope domain's SPF record?
DKIM
Every signature verified against the published key, with key size.
DMARC
Does SPF or DKIM align with the From domain, and what policy does it publish?
Reverse DNS + unsubscribe
PTR that resolves back to the IP (Gmail requires it) and RFC 8058 one-click unsubscribe headers.