Mail not sending properly

When I send mail from webmail the spam score is 10/10, But when i send the email from our website(Wordpress) Its shows 8.9/10, and the error is “Your message is not signed with DKIM”,

When I send the mail from Subdomain its shows 4.9/10.

1. from the subdomain how you are sending it?
2. if the normal score is 10 then the score should be from anywhere.
   which port you are using in Wordpress?

Hi, the main domain score has also 8.9, ans shows “Your message is not signed with DKIM”

We are using wp-smtp plugin, and send as default php mail option

Where dns are managed?

Cloudflare

show me DKIM records in cloudflare records should be added after removing all “”