Message Gears is capable of sending DMARC compliant email because they support custom SPF and DKIM configurations that achieve DMARC alignment. Message Gears is an Email Marketing Platform and is often used by Marketing, Product or Application Development teams. Check out their Whitelabel guide where they touch on email authentication and various steps to consider when adopting SPF/DKIM and DMARC. https://support.messagegears.com/hc/en-us/articles/236281188-Whitelabeling-and-Dedicated-IPs
The link just below is a resource on how to configure this source to send DKIM-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://support.messagegears.com/hc/en-us/articles/236281188-Whitelabeling-and-Dedicated-IPs
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://support.messagegears.com/hc/en-us/articles/115001011687-Email-Authentication-and-DMARC#