The DKIM and SPF procedures described above can be used to verify whether emails actually originate from the specified sender or whether the sending mail server is actually authorised to send emails for a specific sender domain.
However, neither of the procedures or checks contain any instructions concerning how the receiving mail server should proceed if the check is either successful or fails. DMARC fills this gap. The DMARC policy allows you to define the following options for handling failed DKIM or SPF checks:
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‘none’ (= normal delivery of the email)
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‘quarantine’ (= place the email in the SPAM folder)
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‘reject’ (= email will not be delivered)
Note: DMARC requires a domain alignment that passes SPF and DKIM checks.
To use DMARC, you must store entries with your Internet Service Provider (ISP) in the Domain Name System (DNS) in which you define your DMARC policy.
The 
Additional information
Inxmail Professional:
2 possible use cases
Depending on your contract, you might use Inxmail Professional in different ways:
Learn more
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As part of the Inxmail platform: You use newsletters & campaigns as your main tool for creating and sending newsletters. Inxmail Professional only serves as a recipient database and configuration tool in the background.
We are constantly expanding the functionality of “Newsletters & Campaigns”. Check out newsletters & campaigns section to find out if the feature you are looking for might already be available there.
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Full scope: You use the legacy tool Inxmail Professional as your main tool for creating and sending newsletters.
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