DMARC compliance via DKIM. Some evidence of DMARC compliance via SPF as well, but only for very large clients.
Contact customer care to request DKIM functionality and DMARC alignment helpdesk@contactlab.com
Contact customer care to request SPF authentication functionality and DMARC alignment helpdesk@contactlab.com If the source cannot send email with your domain for SPF authentication, you should not have it in your SPF record.