DMARC recording added in domain settings in this form:
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v- the DMARC version. Required parameter The value is always equal
p- domain rule. Required parameter It can take one of the following values:
none- do nothing except send reports.
quarantine- add emails to spam.
reject- reject letters.
sp- rule for subdomains. Can take on the same values as
adkim- allow you to check compliance with SPF and DKIM records. Can take values:
r(relaxed) - soft check.
s(strict) - strict compliance.
pct- the number of letters to be filtered, in percent. For example, for
pct=20only 20% of emails will be checked.
rua- defines the mail to which you want to send daily reports. You can specify multiple mailboxes separated by commas, for example,
ruf- defines the mail to which you want to send reports on messages that have not passed DMARC check. It is set by analogy with
fo- defines the conditions for generating reports. Can take values:
0- send a report if neither SPF nor DKIM authentication is passed. Default value.
1- send a report if one of the SPF or DKIM authentication failed.
d- send a report if DKIM authentication is not passed.
s- send a report if SPF authentication is not passed.
You can use the online DMARC generators to avoid having to manually create a record.
The correctness of the finished record can be checked using the online DMARC validators
What does a DMARC record look like in domain settings: