I have recently received a letter threatening closure of account as our server has been used for mail relay. I am a bit confused.
We have a permanent connection with Exchange 5.5 and VPOP set up. We also have a 3Com office connect firewall.
My question regards the best way to prevent the relaying and to resolve a dispute over responsibility.
Although I understand that VPOP must relay mail to Exchange for the LAN, it is currently configured not to check anything or any IP addresses.
Is it best to have Port 25 blocked on the firewall or to have VPOP configured to check client e mail addresses when relaying.
My second problem is that when I add the IP address range and subnet mask in the configure SMTP section under the Local Servers tab in VPOP, and try sending mail, the response I get is SMTP not authenticated.
I don't know if I am adding the addresses wrongly, I am putting the server IP followed by the subnet mask as follows(obviously with numbers not ***)
192.168.***.0 255.255.255.0
Am I doing something glaringly obviously wrong??
Is it better to have VPOP configured properly rather than simply have the firewall block all incoming to port 25, I welcome any suggestions.
Thanks in advance
We have a permanent connection with Exchange 5.5 and VPOP set up. We also have a 3Com office connect firewall.
My question regards the best way to prevent the relaying and to resolve a dispute over responsibility.
Although I understand that VPOP must relay mail to Exchange for the LAN, it is currently configured not to check anything or any IP addresses.
Is it best to have Port 25 blocked on the firewall or to have VPOP configured to check client e mail addresses when relaying.
My second problem is that when I add the IP address range and subnet mask in the configure SMTP section under the Local Servers tab in VPOP, and try sending mail, the response I get is SMTP not authenticated.
I don't know if I am adding the addresses wrongly, I am putting the server IP followed by the subnet mask as follows(obviously with numbers not ***)
192.168.***.0 255.255.255.0
Am I doing something glaringly obviously wrong??
Is it better to have VPOP configured properly rather than simply have the firewall block all incoming to port 25, I welcome any suggestions.
Thanks in advance