Teneo supports full DMARC compliance.
For DKIM setup, visit: https://esp.teneo.be/blog/2017/10/20/setup-for-spf-and-dkim-with-teneo/
Add 'include:servers.belgium.teneo.be' to your SPF record. For more information, visit: https://esp.teneo.be/blog/2017/10/20/setup-for-spf-and-dkim-with-teneo/