Understanding DMARC

Question

Hi

I have a question around DMARC for exchange.

Does adding a DMARC record to your domain secure outgoing email and also help secure for emails coming into our domain?

If we add DMARC to our domain for example with the instructions set to quarantine if something fails SPF or DKIM that means any email coming INTO our domain that failed SPF or DKIM will be sent to quarantine.

What if however the sending domain has DMARC configured but they have their DMARC set to reject?

Do these conflict in any way? Or is it the value of o your own DMARC record that wins if email is sent INTO your domain?

Answer 1

@Henrik Brown

Does adding a DMARC record to your domain secure outgoing email and also help secure for emails coming into our domain?

DMARC is a mechanism for domains to get reports on DKIM and SPF results for our domain if we have them configured. They let us know what to do if the SPF or DKIM fails for our domain. It specifies what to do when SPF and DKIM failed.

The SPF/DKIM is used to security the mail flow, it is used to improve security of outgoing emails. It can prevent your email from being regarded as spam on the recipient's server.

What if however the sending domain has DMARC configured but they have their DMARC set to reject?

It specifies that the SPF/DKIM records the actions performed after the check fails rather than the actions after the success.

Do these conflict in any way? Or is it the value of o your own DMARC record that wins if email is sent INTO your domain?

It used for inform the recipient's server what do for your email when SPF check failed.

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