email solution for handling multi-domains independently.

[sam]

Dear all,

Does anyone which eMail solution can handle multi-domain names 
independently?
I looked at Openexchange for linux, but found that their virtual domain 
must depend on the main domain, that meant all virtual domains must 
create information in the main domain name first. While this makes sense 
for subdomain such as sub.domain1.com and sub1.domain1.com should have 
email account in domain1.com only, but xyz.com shouldn't have the same 
email account and info in domain1.com.

Thanks
sam

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