If you send out from webCRM via Mailjet you must ensure that SPF & DKIM are set up correctly. You can read Mailjet's own guide on how to it here:

Authenticating Domains with SPF & DKIM

You can always spam test you email on this page: https://www.mail-tester.com/ and get general advice on how to avoid your emails ending up in spam here:

Emails end up in spam (email template)