Error Log filled with emails

I have a web app running in a folder in the root. The error log is filled with apparent emails that all start with:
JavaScript Error: Error: And them text from an email. They appear to be addressed to a different website:

Where are these errors coming from? Can I stop them?

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Hi there,

To me, it looks like a spam problem with a contact form on your website.

I could suggest implementing a captcha on all of your contact forms to prevent bots from abusing the forms.

Regards, Bobby