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Exchange Server default relays
Hello Got a question about exchange sever behavior When I telnet to my onpremise exchange server via tcp/25 I can send an email to anyone within accpeted domian from any e-mail. Even if email ad...
vusald https://www.techrepublic.com/article/prevent-open-relays-on-exchange-server/#:~:text=open%20relays%2C%20follow%20these%20steps%3A%201%20Go%20to,connect%20to.%20%28TCP%2FIP%20port%2025%20is%20for%20SMTP.%29