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My suggestion would be to check the way that the email is sent and the subject / body of the email.
For example some systems will always mark the email as spam if the subject of the email matches the suspicious or known bad keywords from their database.
It also could be caused by the way you send your email to your email address.
My suggestion would be to check out this guide: How to setup email alerts to prevent email bouncing related issues
I presume that you are sending emails over Verified sender, which is likely causing this issue, in which case the guide above will show you how to resolve the same.
If you still continue having the same issue, please do let us know.
In that case, do let us know what is the form and we will check its setup to see if we can see anything from our side.