Dialog Insight supports full DMARC compliance. For more information, visit: https://support.dialoginsight.com/en/support/solutions/articles/1000264738-authentication-validation-through-dmarc
Contact Dialog Insight support for DKIM configuration. For more information, visit: https://support.dialoginsight.com/en/support/solutions/articles/1000264735-set-up-a-dkim-signature
Add 'include:ofsys.com' to your SPF record. For more information, visit: https://support.dialoginsight.com/en/support/solutions/articles/1000264736-configuring-an-spf-protocol