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.
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.
For more information please click the button below.
Create a free OnDMARC account to test your configuration.