Messages with @Gmail in Form Field Not being Received

Using Contact Form 7, I can receive messages via a form that has name, email, phone, message as long as the Email address the user types in does NOT contain @gmail.com.

So if the user fills out the form with @any-domain.com are received.
If the user fills out the form with @gmail.com it is never received.

My FROM field in the form is just the email address @my-domain.com, not the users’ email.

Any thoughts on how to fix this? This is something that I’ve just started to notice and it seems that no matter what sort of Email account I try to send to, it’s always the same situation.

Thank you for your help!