Internet SMTP mail routing internally

[eddster]

Hi,

Can anyone tell me if this may work?

We have to share a name space with another 3 companies.
We will be accepting all mail for company.com
We will want to route this accordingly to either us, 1.compay.com, 2.company.com or 3.company.com via the WAN.

In the AD I want to have a seperate OU for each company to which I shall apply a recipient policy that says the PRIMARY address is firt.last@1.company.com (2.company.com or 3.company.com depending on the OU) and the secondary is first.last@company.com.

I'll then set up an SMTP connector for each domain (1/2/3.company.com) pointing to their repsective smarthosts allowing relaying, of course for these address spaces.

When a mail comes in to x.y@company.com will it then be matched to a contact in the AD and relayed using the respective primary address@1/2or3.company.com? Or will it try to route purely on the basis of the secondary company.com address and thus NDR?

Hope that makes sense,

Thanks in advance.

 

[georgesz]

check out this whitepaper on Exchange hosting multiple orgs

http://support.microsoft.com/default.aspx?scid=kb;en-us;262183

Georgesz

 

[eddster]

That's great thanks.
It'll do the job I want. It is however a little harder to implement than the above idea. Does this mean that the above idea WON'T work?

Thanks....

 

[georgesz]

I have not tried exactly what you are mentioning, but I know that as long as a Recipient Policy does not overwrite email addresses stamped by another policy, then it should work. As long as the SMTP address is uniquie in the org, email will be delivered.

georgesz

 

[eddster]

Thanks Georgesz, it works.