relayservers
Relay servers are servers that receive messages or traffic and forward them toward their destination rather than generating the content themselves. They act as intermediaries in communications, helping to route, filter, or transform data as it passes through a network. The term is used in several contexts, most commonly for email relays and for network proxies.
Email relay servers (SMTP relays) accept outgoing mail from clients or other mail servers for a given
Network relay servers act as forward or reverse proxies for client requests. A forward proxy relays client
Security and reliability are central concerns. Operators implement authentication (for email relays), encryption (TLS), access controls,
See also: SMTP relay, proxy server, open relay, TLS, anti-spam measures.