Box Trapper with contact forms

Good morning all. I am attempting to use Boxtrapper on my website to avoid spam and fake email addresses. I am using a contact form on my website to send emails to a specific email address on my domain. If someone sends an email directly to this email address, Boxtrapper works and requires the verification. But if an email is sent through the contact form, it goes through without verification. The logs show the following message:

Processing email with trusted transport method [local]

It appears that for some reason Boxtrapper is set to allow messages to go through since my server is handling the contact form locally. Is there a way to fix this?

Thanks in advance,
Jeff