Secure Email Gateway

•  Spam—the act of sending Irrelevant and unsolicited messages on the

internet to a large number of recipients.

Phishing to describe the fraudulent practice of

Sending emails purporting to be from a reputable source, in order to induce individuals to

reveal personal information

Spam filters rely on Identifying specific words or patterns in the headers or bodies of messages

ISPs began to implement the Sender Policy Framework SPF, which slowly took shape

during that decade but wasn’t proposed as a standard until 2014.

SPF is an Email authentication method that Detects bogus sender addresses and emails. 

Secure email gateways arose to provide more rigorous defense. In

addition to the spam filter, they added Antivirus scanners, Threat emulation, and Sandboxing to

detect malicious attachments and links in real time

Today, greater Automation and Machine learning are built in to secure email gateways, which

alleviates the demands placed on security operations centers. Data loss prevention DLP is also

available to detect and stop the egress of sensitive data. 

In some cases, a secure email gateway isintegrated with other network security devices, such

as edge and segmentation firewalls

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