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

include:spf.ssmx.net
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You can configure DKIM support through Account / My Account / Email Sender Settings.

For more information please click the button below.

Create a free OnDMARC account to test your configuration.