Mail closes

You have a malformed email in your Junk Folder. This will be the mail that is selected by default. You will need to delete it. To do so, open Mail, click View > Use Column Layout and delete the selected email. Then click again on Use Column View to remove this view.

Mail closes, I call it crashes, when opening an attached pdf file. been reported twice so far!!!!

Please follow the steps as outlined in https://support.apple.com/en-euro/guide/mac-help/mchlp2579/mac#:~:text=When%20an%20app%20on%20your,You%20may%20lose%20unsaved%20changes.