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open relay Last modified: Tuesday, December 02, 2003
Also referred to as an open relay server, an SMTP e-mail server that allows a third party to relay e-mail messages, i.e., sending and/or receiving e-mail that is not for or from a local user. Open relays make it possible for mobile users to connect to corporate networks by going first through a local ISP, which then forwards the message to their home ISP, which then forwards the message to the final destination. However, a downside of open relay technology is the proliferation of its usage by spammers looking to obscure or even hide the source of the large-volume e-mails they send. Open relay also is called spam relay, third-party relay or insecure relay. Contrast with mail relay.
Open Relay Database A non-profit organization which stores IP addresses of verified open SMTP relays. What is Third-Party Mail Relay? This document is an introduction to the third-party mail relay problem.	Related Categories Business Computing Electronic Mail Internet and Online Services Servers Related Terms e-mail e-mail address e-mail aliasing ISP server spam