CIDR ranges do work. I believe the manual contains examples of this. For example:

IPBYPASS                    24.73.160.162
WHITELIST        IP     192.168.0.1/24

Just to be clear on the conditions present, the whitelisting won't work if you have users that connect directly (or through your firewall when IPBYPASS'ed) from other networks. For example, a user that is connecting from home using their own broadband connection to send E-mail directly to your SMTP server will not be whitelisted using this method, and this would also result in them failing SPF under this setup, and might fail CMDSPACE. If you have remote users like this, the suggested fix won't work as desired and if you are running IMail 7 and not IMail 8, both SPF and CMDSPACE are probably inappropriate (you can add WHITELIST AUTH to your global.cfg with IMail 8 that will take care of this problem, but this won't work with IMail 7).

Matt



Sharyn Schmidt wrote:

Chances are that you need to IPBYPASS the firewall's IP in your global.cfg and then whitelist your LAN by it's IP space.



Do I have to list each individual address separately (will put it at over
200 addresses so this won't work) or can I use a /24 notation for each
subnet block?

Sharyn


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