Mailjet is capable of sending DMARC compliant email because they support custom DKIM and SPF configurations that achieve alignment. This source is capable of sending a number of different message types, ranging from transactional messages to marketing. Mailjet offers a quite sophisticated solution for marketing departments with strong technical skills and software development teams. This is a great resource for learning about how to set up email authentication for Mailjet: https://documentation.mailjet.com/hc/en-us/articles/360042412734-Authenticating-Domains-with-SPF-DKIM
The link just below is a resource on how to configure DKIM. You will complete this configuration by (1) following the sources instructions and (2) adding the required entries into your DNS. https://documentation.mailjet.com/hc/en-us/articles/360042412734-Authenticating-Domains-with-SPF-DKIM#h_e1069a6e-0a9c-422a-bb9a-a82ded3d937a
The link just below is a resource on how to configure SPF. You will complete this configuration by (1) following the sources instructions and (2) adding the required entries into your DNS. https://documentation.mailjet.com/hc/en-us/articles/360047253194-Can-I-customize-the-return-path-header-with-Mailjet-