To authorize Datto Autotask to send emails on your behalf you will have to include it in your SPF record. The SPF record mechanism used for Datto Autotask is shown below.
Datto Autotask support DKIM signing for your custom domain. For more information on how to set up DKIM for Datto Autotask please click on the button below.
Create a free OnDMARC account to test your configuration.