To allow FireDrum to send emails on your behalf, you will have to add them to your SPF record. The SPF mechanism used by FireDrum is shown below.

include:mtas.firedrumemailmarketing.com
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You can configure DKIM by logging into your Email Marketing account and selecting "Configure Account". You can find the DKIM records in the "Authenticated Domains" section.
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For more information please click the button below.

Create a free OnDMARC account to test your configuration.