False positives can occur for a variety of reasons. Some common causes include:
1. Content Filter Triggers: Certain words or phrases in the email may trigger spam filters. 2. Poor Sender Reputation: If your domain or IP address has a history of sending spam, your emails are more likely to be flagged. 3. Improper Use of HTML: Incorrect HTML coding can sometimes be flagged as suspicious. 4. Lack of Authentication: Emails that lack proper authentication protocols like SPF, DKIM, and DMARC are more likely to be marked as spam.