In order to implement DMARC you need a valid DMARC record. At Mimecast we provide a free and easy to use DMARC Record Checker to display your DMARC record, test it and verify that it is valid. To perform a DMARC record check you will only need to provide your domain name. The DMARC Record Check will then parse your DMARC record and display the DMARC record along with additional information.

    Use the DMARC Record Checker to test and lookup your DMARC record. The DMARC Record Checker will also verify and test if you are using external domains.

    Use the DMARC record checker to validate your DMARC record(s)

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    Results of a DMARC Check

    A DMARC record check performed with the DMARC Record Checker will test and declare the following tags.

    tag explanation
    v DMARC protocol version.
    p Apply this policy to email that fails the DMARC check. Can be “none”, “quarantine”, or “reject”. “none” is used to collect the DMARC report and gain insight into the current email flows and their status.
    rua A list of URIs for ISPs to send XML feedback to. NOTE: this is not a list of email addresses. DMARC requires a list of URIs of the form “mailto:test@example.com”.
    ruf A list of URIs for ISPs to send forensic reports to. NOTE: this is not a list of email addresses. DMARC requires a list of URIs of the form “mailto:test@example.org”.
    rf The reporting format for forensic reports. This can be either “afrf” or “iodef”.
    pct The percentage tag instructs ISPs to only apply the DMARC policy to a percentage of failing email’s. “pct=50” will tell receivers to only apply the “p=” policy 50% of the time against emails that fail the DMARC check. NOTE: this will not work for the “none” policy, but only for “quarantine” or “reject” policies.
    adkim Specifies the “Alignment Mode” for DKIM signatures and can be either “r” (Relaxed) or “s” (Strict). In Relaxed mode, authenticated DKIM signing domains (d=) that share an Organizational Domain with an emails ‘From’ domain will pass the DMARC check. In Strict mode an exact match is required.
    aspf Specifies the “Alignment Mode” for SPF and can be either “r” (Relaxed) or “s” (Strict). In Relaxed mode, authenticated SPF domains that share an Organizational Domain with an emails ‘From’ domain will pass the DMARC check. In Strict mode an exact match is required.
    sp This policy should be applied to email from a sub-domain of this domain that fails the DMARC check. Using this tag, domain owners can publish a “wildcard” policy for all subdomains.
    fo Forensic options. Allowed values: “0” to generate reports if both DKIM and SPF fail, “1” to generate reports if either DKIM or SPF fails to produce a DMARC pass result, “d” to generate report if DKIM has failed or “s” if SPF failed.
    ri The reporting interval for how often you would like to receive aggregate XML reports. This is a preference and ISPs could (and most likely will) send the report at different intervals (normally this will be daily).

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