Autotask (by datto) is capable of sending DMARC compliant email because they support custom SPF and DKIM configurations that achieve DMARC alignment. Autotask (by datto) is a Business Automation Platform and is often used by IT, Product or Application Development teams.
Autotask does support custom DKIM signing, though their hosted support articles do not make it immediately clear on how to configure DKIM. Either explore the context menu and select Authentication Details or open a support ticket for assistance. The most recent support alias we found was at https://help.datto.com/s/
The link just below is a resource on how to configure this source to send SPF-aligned email on your behalf. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. https://help.datto.com/s/article/KB360021829711