Heuristic filters evaluate a variety of factors to assess the credibility of an email. These include:
Sender Reputation: The historical behavior of the sender's email address and domain. Content Analysis: The presence of spammy keywords, excessive links, and unusual formatting. Engagement Metrics: User interactions with previous emails from the same sender. Technical Elements: Email headers, IP addresses, and authentication protocols like SPF, DKIM, and DMARC.