this is a notification from Your Email Gateway reporting a certain Email that has a suspicious Spam-Score. Obviously there is an option on Your ruleset that reports such Emails, dependent to the spamscore.
So its on You what to do with it. You may ignore it, or do some deeper investigation on the spam-score and establish some decent rules to prevent this Mail from beeing accepted by the EMail Gateway in the future.
Of course You also may disable notifications of the Anti Spam Scanner, if that bothers You 😉