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DMARC & DKIM are required to authenticate an email message.

The DKIM record is provided on the inbox.eu side without the possibility to edit it

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 record will automatically be added to your domain. Which will 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:

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

or 

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

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