Forum Discussion
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...
Exchange Server is designed by default to accept SMTP connections from all sending mail servers, however it rejects messages where the recipient is not an accepted domain your Exchange organisation (it would constitute an open relay if it did accept and relay these messages).