To authorize SonicWall to send emails on your domain’s behalf you will have to include it in your SPF record. The SPF record mechanism used by SonicWall is shown below.
SPF record for NOAM location: include:_spf.snwlhosted.com
SPF record for EU location: include:_spf.snwlhostedeu.com
To enable DKIM for your domain please click on the button below for instructions.
Create a free OnDMARC account to test your configuration.