Email tools
Check the DNS records that protect a domain's email.
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SPF Checker
Check that a domain's SPF record is valid, stays within the 10-lookup limit, and says what you expect about servers that may send its mail.
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DMARC Checker
Find the DMARC policy that applies to a domain, see what each setting means, and spot mistakes that make receivers ignore it.
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BIMI Checker
Check whether a domain is set up to show its logo next to its emails: the BIMI record, DMARC, the logo file and the mark certificate.
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MTA-STS Checker
Check whether a domain asks other mail servers to use secure, verified connections when they deliver its email.
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TLS-RPT Checker
Check where other mail servers send reports when they can't make a secure connection to a domain's mail servers.