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DMARC & DKIM are required to authenticate an email message.

The DKIM record added automatic if domain will be validated by DNS method or should be required added manually for domains with MX or TXT validation method. DKIM record contain:

default._domainkey CNAME customer._domainkey.inbox.eu

Record type - CNAME

Example, how add DKIM record to nic.lv portal:

Example, how add DKIM record to godaddy.com portal:

You can add DMARC to your domain, but your domain can only have one DMARC record.

If your domain's DNS records are at inbox.eu, a DMARC and DKIM records will automatically be added to your domain. DKIM contain:

neutral reads "v=DMARC1; p=none;"

If necessary, you can increase the security level and change the DMARC record to:

strict reads "v=DMARC1; p=quarantine;"

If you manage your domain's DNS records yourself, it is recommended that you add one of the DMARC records yourself:

DMARC is TXT record
Hostname: _dmarc.domain.com
Content: v=DMARC1; p=none;

1. neutral reads "v=DMARC1; p=none;"

or 

2. strict reads "v=DMARC1; p=quarantine;"

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