Exchange 2007 SMTP problem

Because exchange 2007 isnt really compatible with outlook 2016 autodiscover we want to use POP and SMTP on this server. But the current receive connector rules  only allow specific IP addresses.

Also because they have on site scan to email printers we have had to allow the permission groups such as anonymous,

Because of this i cant see how i can allow all external IP addresses without opening up a big hole for spammers to abuse the server.

Has anyone got any suggestions how i can allow local scan to email with anonymous user but only allow external IP users to email with credentials?
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You can limit the receive connectors to specific IPs so for example if your internal network is 192.168.1.x, you should be able to configure the anonymous "relay allowed" connector to only work on a 192.168.1.x address, but have a second connector on the same port with relay turned off, with unlimited address range..

A larger question may be why you're not upgrading!

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