To allow Crisp to send emails on your behalf, you will have to use a sub-domain of your main domain to dedicate to Crisp emails.

Afterwards, you need to add the following SPF entry in your DNS:

v=spf1 redirect=_spf.crisp.email

For more information please click the button below.

For further information on configuring DKIM please contact Crisp support.
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Create a free OnDMARC account to test your configuration.