Question

Routing specific messages via a VPN

Asked by: midocean

Evening all,
 
In this scenarion we have two companies (let's call them Co.1 and Co.2) who have a business relationship whereby Co.1 works for Co.2 and Co.2 allows Co.1 access to some of their systems and databases via a secure VPN.
 
Co.1 has a SBS2003 server and traffic to and from Co.2 is routed via a Cisco ASA5505 at Co.1 and a Cisco Concentrator at Co.2.
 
As a further layer of security Co.2 are now asking that all emails from Co.1 to Co.2 are also routed via the secure VPN rather than via Co.1's normal Internet SMTP servers
 
The question is - what is the best (and easiest) way of doing this?
 
Dave

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Asked On
2009-08-06 at 13:37:41ID24632996
Topics

SBS Small Business Server

,

Exchange Email Server

,

Virtual Private Networking (VPN)

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: alanhardistyPosted on 2009-08-06 at 13:44:32ID: 25037878

You can create an SMTP connector that sends mail directly to company 2's server (you have not mentioned if they have one - so I am assuming they do) and setup the address space for this connector to only send mail for this domain down this route.

If you send via the IP address as the SmartHost, use [ ] brackets around the IP address to make it work properly.

Info on SMTP connectors - http://support.microsoft.com/kb/265293

 

by: tigermattPosted on 2009-08-06 at 13:46:16ID: 25037894


The easiest way is to create an SMTP connector which defines @co2.com as its SMTP address space (the domains it handles email for). The SMTP connector should then be configured to communicate directly with the IP address/internal DNS name of Co2's inbound email servers.

The address you specify must be configured in the routers to route across the VPN, rather than attempt to go out onto the Internet.

More information on SMTP connectors at http://www.amset.info/exchange/smtp-connector.asp.

Note that when you specify the address space for @co2.com, you'll be asked to provide a cost value. This can be any number - but lower is usually better. I'd put '1' or '10' in there. You'll then have to edit the existing SMTP connector, where the Address Spaces tab will have '*' entered (for all other domains). Edit the '*' entry and set a higher cost from the value you entered previously.

Higher Cost = Lower Preference

-Matt

 

by: midoceanPosted on 2009-08-06 at 14:07:23ID: 25038068

Thanks both of you for the prompt response. I'll give it a go in the morning and let you know how I get on.

20120131-EE-VQP-002

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