form submissions going to spam

Hi – have been having issues with all the contact form submissions going to my spam/junk mail folder. I created a rule in Outlook to automatically send emails containing the subject line XXX, but emails are still going to spam. Not all, but most. Is there a setting in Contact Form 7 to help with this or is it an Outlook issue? Every time the inquiries go into spam, I click on “not spam” and then “report to MSFT”, but clearly, no one is listening since the issue persists ?? Any ideas?