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Can You Filter eMail

By Shay ·
I am trying to filter email using MSexchange. I need to sort out internal mail from external mail on the outbound side of exchange. I want to limit certain users at certain times from getting external mail but still want them to get internal mail.Is there a way to do this?

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Can You Filter eMail

by Shay In reply to Can You Filter eMail

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Can You Filter eMail

by McKayTech In reply to Can You Filter eMail

This is a difficult task to accomplish and I'm not aware of any easy way to do it. It would be possible to write a batch file that would turn off the Internet Mail Service and run that batch file at a certain time using the Task Scheduler (or AT orWinAT) but that would affect all external mail for all users.

I don't even know of a third-party utility that would do this but I would be glad to be proven wrong if someone else does.

paul

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Can You Filter eMail

by Shay In reply to Can You Filter eMail

My goal is to write a policy/filter that I can apply to my switch that would block Internet mail from being sent to the user(s) associated with that port. They still need to get internal email. I just don't know enough about exchange to know what protocol(s) that it generates on the outbound side to apply a filter. Does exchange send all out bound internal email using the same protocol?

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Can You Filter eMail

by McKayTech In reply to Can You Filter eMail

To answer your second question, all interaction between an Exchange server and an Exchange client (e.g. Outlook) takes place using the same Remote Procedure Calls (rpc) and it is not possible to separate out internal e-mails from external e-mails atthat point.

The only way it would be possible to do something like what you want would be to set up the desktop client to bypass the Exchange server for external e-mail (i.e. use POP3 and SMTP) and then block ports 25 and 110 at the times you want to disable external e-mail.

I'm not sure exactly what you're trying to accomplish but it might have the same effect to implement logging and let the users know the logs are reviewed daily.

paul

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Can You Filter eMail

by Shay In reply to Can You Filter eMail

Do you block the ports on the client desktop or can you block the switch the client is connected to?

It is hard to explain exactly what I need. Basically, I want to isolate a location from external email. Users will move in and out of this location. For security, receiving/sending external email is not allowed in this "chamber". Only internal/intranet email allowed.

I believe that yo are close to a possible solution by bypassing exchange for external mail by blocking the ports.

Any other thoughts?

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Can You Filter eMail

by Shay In reply to Can You Filter eMail

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Can You Filter eMail

by McKayTech In reply to Can You Filter eMail

Generally, the only devices capable of reliably blocking particular ports are routers and firewalls; switches do not, in my experience, have the ability to block particular protocol ports although some can block by protocol (e.g. allow only IPX but not IP or vice-versa).

As you've described your situation, a firewall between your secure area and the rest of the network is the most realistic solution. If you wanted to take a walk on the wild side, a Linux-based router based on a 486 with 12meg of RAM and using software from the Linux Router Project would accomplish your objective at minimal cost.

Such a firewall would provide not only port blocking and restriction of available addresses but also provide a security log.

paul

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Can You Filter eMail

by Shay In reply to Can You Filter eMail

Your suggestions and help have enabled me to figure a possible solution to my problem. I will send you an email directly explaining excatly we we decided. I will have to you by end of day Tuesday. Thanks again for your assistance.

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Can You Filter eMail

by Shay In reply to Can You Filter eMail

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