Send mail to Gmail SPAM

You can try to see if your domain is marked as blacklist with mxtoolbox.com

And try to send some email from webmail/outlook to gmail. If the mail is still in spam, then the problem is in your server/host.
 
The biggest issue I see with spam is not having appropriate rDNS records set. Of course, that only applies if you are running your own VPS or dedicated server.

If you're on a shared server, you might also want to check if the IP address is blacklisted. Note that the mail IP might be different from the IP address of your website, so this might perhaps be something you need to ask your host.
 
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