Need to close exchange 2010 Open Relay HELP!
I have an emergent need with exchange 2010 acting as an open relay. I have checked all the settings through the EMC and they look good. I have issued the following command on all the receive connectors and it either remove the access or said there was no ACL. Get-ReceiveConnector “Windows SBS Internet Receive SMSCORPVS0SBS” | Remove-ADPermission -User “NT AUTHORITY\ANONYMOUS LOGON” -ExtendedRights “ms-Exch-SMTP-Accept-Any-R
did you check the send connector this is what allows someone to send through your server
Since enabling anonymous relaying on the default receive connector is a huge security issue ,i have suggest you to create separate receive connector
Here is an article wrote by Akhater that will guide you through it step by step
https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2666-Allow-relaying-on-Exchange-2007-Exchange-2010-in-4-easy-steps.html
Here is an article wrote by Akhater that will guide you through it step by step
https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2666-Allow-relaying-on-Exchange-2007-Exchange-2010-in-4-easy-steps.html
you can check the accepted domains value
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I can telnet through the public IP to port 25 and send as anyone from any domain. I need to stop this. Where is the accepted domains value you are talking about? What am I checking on the send connector? It looks the same as all our other clients that are not open relay.
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That was it. Internal relay was setup with accepted domain of *
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