configure webmail URL for accepted domain

Hi,

we have a single forest, single domain organization e.g. abc.com, & accepted domain,e.g xyz.com & cde.com .For abc.com we used webmail.abc.com URL, now user want webmail URL same as accepted domain name like webmail.xyz.com,webmail.cde.com.

So please suggest what would be the best strategy to achieve this goal and also please guide procedure.

Thanks & Regards

Pradip