Shopify is capable of sending DMARC compliant email because they support custom SPF and DKIM configurations that achieve alignment on most plans. This source is most commonly known to send eCommerce emails and is often used by Marketing and Product teams.
The link below is a resource on how to configure DKIM. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. In particular, they will ask you to create a series of CNAMEs. The use of CNAMEs is becoming increasingly popular and is an agreeable tactic. Link: https://help.shopify.com/en/manual/intro-to-shopify/initial-setup/setup-your-email#add-shopifys-spf-record-to-your-domain-host-custom-domains-only
The link below is a resource on how to configure SPF. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. In particular, they will ask you to create a series of CNAMEs. The use of CNAMEs is becoming increasingly popular and is an agreeable tactic. Link: https://help.shopify.com/en/manual/intro-to-shopify/initial-setup/setup-your-email#add-shopifys-spf-record-to-your-domain-host-custom-domains-only