Google sending multiple emails every day??

I have a form that is filled out and goes to a results page, the results page has a UE5 behavior that emails the user the info he submitted along with additional info pulled from a mySQL db. I have a Google (Gmail) address used as the sender, I have the user as the recipient, and I have it CC'd to another different Gmail account. I have Gmail set up as the SMTP sender. My domain has Google set up for all MX records.

The problem I'm having is the email will be sent just fine to all parties but then the next day (or two) all parties will receive the same email, sometimes three or four times over the course of three or four days. The duplicate emails are not in any order. The user email info is not captured in the db at all, the only place the email COULD reside is in a Gmail mailbox.

This is making me crazy and Google has not been much help. I just wondered if any other UE5 user has had this kind of issue. Thanks in advance -Tom

That is very odd. I haven't heard of that happening before. You could set up email logging in UE to make sure that it only sends the mail request once to eliminate that possible cause, but really it sounds like an issue with the Google SMTP server somehow.