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Segreggating SMTP and other Network Traffic


I am using cisco router with 128kbps link to connect to my head office router.

I am using voice over ip as well as data (Including As/400 Application Lotus Notes and other traffic.

At times all my traffic data+voip floods across the Wan link and the Branch Office users get poor network response when they try to access their applications stored in the Head office server.

I want to Seperate the Traffic by using one more router i.e,

I will be using one 1700 series router with ISDN line to allow only MAIL applications.In short I want only my SMTP traffic to flow from the 1700 series router and the rest traffic (VOIP+AS/400) from my old router.

How to do that (One Way is to define access-list on 1700 router to allow only SMTP traffic and drop all other traffic) Sample configuration is welcomed.

Also any other Solution to the problem is Welcomed.

Thanks in advance.

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Re: Segreggating SMTP and other Network Traffic