KB Glossary: Firewall

Firewall

A program or set of programs designed to keep unauthorized users or messages from accessing a private network. The firewall usually has rules or protocols that authorize or prohibit outside users or messages. In email, a firewall can be designed so thast messages from domains or users listed as suspect because of spamming, hacking or forging will not be delivered.

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Man With Digital Tablet Reading E-Mail Message Online Sitting Outdoor

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