subdomain delegation for email routing

Thu Sep 25 16:38:03 PDT 2003

I have a client (company1.com) who has customers send email to several 
special email accounts (such as customer service which goes to 
care at company1.com). These emails are processed along with all other 
corporate email by the corporate mail server and then forwarded to an 
outside vendor (webservice.com) that handles these special email accounts. 
A backup copy is made and kept by company1.com and the original is 
forwarded to the vendor (e.g., to company1-cs at webvendor.com) and the vendor 
responds to the email. Unfortunately average response times are 48 hours.

My client wants to have the customer service email delivered directly to 
the outside vendor and I suggested that they create a subdomain 
care.company1.com and delegate this subdomain to the vendor:

care.company1.com IN  NS  ns.webservice.com
care.company1.com IN  MX  mail.webservice.com

The vendor can forward email from care.company1.com to the appropriate end 
user and then forward a backup copy to company1 (e.g., backup.company1.com) 
.

Is this possible?
What DNS config is required?
Are there any pitfalls/better ways?

Thanks,
Alan

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