Gmail tagging some emails with {Spam?}

For the past month or so I've noticed some emails tagged with {Spam?} in the subject line.

These emails are in my Inbox (and in most cases are not spam).  I did some searches online but only finding articles on Google's help pages related to email that is going into the spam folder, but I can't anything about messages being tagged with {Spam?} .

I'm trying to figure out where this is configured. I don't think I'm using a 3rd party service to do this (I've used to help me mass unsubscribe from newsletters, but as far as I know that wouldn't be marking my emails)

Is this some new Gmail thing that isn't well documented? Or any ideas what may be doing this?

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Do you have external emails you pop into gmail? Do you have email addresses that you forward to gmail?
Check your configuration for spam settings.
Check the full message headers to see ..............
If it is spam, Mark/tag the message as spam, if it is not .........

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VasAuthor Commented:
Ah good call, I do have emails that forward into the gmail account and in fact I switched service providers for those domains recently and it does look like it's only those forwarded mails doing that.

I'll contact the ISP that is managing those domains/email.  Thanks  :)
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