Not receiving mail from contact forms

Hello,

I have some forms set up on my site and they for some reason will not send email to certain email addresses. I am using the plugin Contact Form 7 but I do not believe it is an issue with the plugin.

The emails I am trying to send to are Google Accounts so I am not sure if that may be a problem.

Here is what I have tried:

Searching for bugs for Contact Form 7
Changing my DNS MX Records to point to the correct Google one.
Using the WP SMTP Mail plugin.

It seems to only cause an issue when I change the email to send to to be that of the same domain. So if my domain was example.com then test@example.com would not go through. However, test@test.com, test@blah.com, test@whatever.com would all work perfectly fine.

I have tried really hard to find out what is going on and can't seem to find the underlying issue. Anyone that helps is greatly appreciated!! Thanks in advance!