SPF
To allow Atmail to send emails on your behalf, you will have to add them to your SPF record. The SPF mechanism used by Atmail is shown below.
Europe server: eu-spf.atmailcloud.com
USA server: us-spf.atmailcloud.com
DKIM
You can configure DKIM support through Atmail. To learn more please see the button below.
Create a free OnDMARC account to test your configuration.