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We accept
See the SPF, DMARC, and DKIM records a domain publishes, then the MX servers that receive its mail.
SPF lists the servers allowed to send mail for a domain. DMARC tells receivers what to do when a message fails SPF or DKIM, and where to send reports. DKIM is a public key that signs outbound mail.
This check looks for SPF on the domain, DMARC at _dmarc, and DKIM on the selectors default, google, selector1, s1, and k1. A custom selector will not appear until you look it up in your mail host.
A TXT record that starts with v=spf1. The page shows the record. It does not send a test message.
On the host _dmarc, as a TXT record that starts with v=DMARC1.
The selector may not be one of the common names we try. Copy the selector from your mail host and check that host directly.