Secure Email Gateways (SEG) inspect and filter inbound and outbound email at the perimeter, blocking phishing, malware, spam, and business email compromise before delivery, and applying outbound controls like encryption and content policy. The category spans classic MX-record gateways (Proofpoint, Mimecast, Barracuda, Cisco) and the API-based integrated cloud email security (ICES) challengers (Abnormal Security, Sublime Security) that sit behind Microsoft 365/Google Workspace rather than in front of the mail flow.
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