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How to prevent e-mails sending through t

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5 replies

by lwm_cck_sg

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Current Situation
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1. DNS server with smtp port open.
2. Using Lotus Notes as Corporate email.

Question
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How to prevent users from sending e-mails using Microsoft Outlook & Outlook Express by defining DNS server on both softwares in the SMTP server and POP server options?

5 replies

by cavedweller

Get a firewall such as Tiny Software's WinRoutePro (which I use). Create a packet filter rule which allows your Notes Server to access the SMTP port but denies all others.

by estebandelatorre

You will need to setup a firewall and the define a packet rule, only to allow smtp port 25 to comunicaty with only one machine, the mail server
Also define another packet filter in order to let resolve dns to the email server (or proxy if you have one)

But, if you don't need DNS for browsing the internet or comunicating with other hosts, just change your DHCP server in order to not deliver the DNS address to users, and define a policy which does not allow users to change network properties.

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