To authorize Zoho Creator to send emails on your behalf you will have to include them in your SPF record. The SPF record mechanism used for Zoho Creator is shown below.

include:usermail.zohocreator.com
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To enable DKIM for Zoho Creator, please copy the unique public DKIM Key generated in Zoho Creator into your DNS.
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For more information please click the button below.

Create a free OnDMARC account to test your configuration.