An **open mail relay** refers to an email server configuration that allows anyone on the internet to send email through it, without any authentication. This means that any person or system can use the mail server to send messages to any recipient, regardless of whether they are authorized to do so. ### Key Characteristics of Open Mail Relays: 1. **Lack of Authentication**: Users do not need to provide credentials (like a username and password) to send emails through the server.
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