Evolution email labels random emails as important

Do you have a lot of emails in Evolution being labelled as important in red but you have no mail filters doing it and can't work out why it is happening? Do you also have Nextcloud with the mail app installed? If you do then I may have found the solution to your problem. Nextcloud mail is automatically classifying your emails and then Evolution is displaying the classification.

To fix, go into your Nextcloud account. On your Email page open the left side bar with the icon at the top and then scroll down to settings at the bottom. In settings, untick the box that say, "Automatically classify importance of new email".

This will hopefully solve your problem. It did with mine and now I don't have a sea of red "important" emails filling my inbox.

Image source: Email icon.svg