DMARC

A DMARC policy allows a sender to indicate that his emails are protected by SPF and/or DKIM, and gives instructions on how to proceed if none of these authentication methods are successful.

_dmarc IN TXT "v=DMARC1; p=..."

p=none

No specific advice is offered to the receiving MTA.

p=quarantine

Advises the receiving MTA to treat any email that fails any DKIM and/or SPF checks as suspicious and perform additional checks or mark the mail as suspected SPAM or whatever local policy is in operation.

p=reject

Advises the receiving MTA to reject any email that fails any DKIM and/or SPF checks.

Example

_dmarc IN TXT "v=DMARC1; p=reject; rua=mailto:5e866b5-d@dmarc.report-uri.com"

DMARC for incoming mail

See also