In order to setup your SPF and DKIM records, you need to first login to your Mandrill account, then go to Settings > Domains. From there you’ll see your domain
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DKIM configuration documents
Information on how to configure SPF and DKIM for vendors like Sendgrid, Mailchimp, Office365 etc. DKIM configuration for AmazonSES DKIM configuration for Office 365 cloud DKIM configuration for Salesforce cloud