DMARC compliance via DKIM and SPF.
See article and contact Emarsys support to configure DKIM: https://help.emarsys.com/hc/en-us/articles/213691489-Email-Deliverability-Sender-Authentication-Guide#configuring-dkim
See article to configure SPF: https://help.emarsys.com/hc/en-us/articles/213691489-Email-Deliverability-Sender-Authentication-Guide#sending-via-emarsys
Emarsys is a member of the Certified Senders Alliance. Click the CSA Logo on the right to find the certificate on CSA's website.