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Glossary

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O Open Relay - Most modern email servers will not allow unauthorized users to send email through them. Some email servers, however, will allow outsiders to send (or relay) email through them. These servers are known as "Open Relay Servers". OpenPGP - An encryption standard for email that allows sender authentication using digital signatures and can be encrypted using public key cryptography to protect privacy. OpenPGP builds on and extends MIME. OpenPGP messages inter-operate well with any standard-compliant email client Opt-In - Technically, opt-in email marketing means sending marketing messages only to people who explicitly requested them. If a customer asks for a specific piece of information, you have the permission to send that information and nothing more. In practice, however, some spammers consider anyone who hasn't explicitely "opted-out" to be "opt-in". Opt-Out - The practice of explicitely asking not to be contacted via email.