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Website email problems

Some of the websites that I created for clients on various third-party hosting companies (Bluehost, Siteground, etc.) are not receiving email from the contact form I created for each site. I can submit the form but if the recipient's email domain name is the same as the site domain, the email won't be delivered. However, if I include my personal Gmail account in the form, I always receive the email. I don't understand why this is happening lately. It might have something to do with DKIM records, which I haven't been able to set up successfully.