[IMail Forum] DNS Question

[Waheed]

Hi All, If I have a domain named ABC.Com and I need to give my customer the ability to get mails @ my domain, no actually not @ my domain but @hisCompany.ABC.Com means his mail will be [EMAIL PROTECTED]. I Use an external DataBase. I need this to be done on-line by the customer through the web messaging not manually by me!!! The Customer will write http://mail.ABC.Com then he will find a link to adding a new user in which he will submit his data including his company name thewill appear after @ sign. First: how can I add it in DataBase so his mail will be [EMAIL PROTECTED].  When I tried to insert this ( [EMAIL PROTECTED]) in the MAILADDR field then test it in login it accepts [EMAIL PROTECTED] because it's in the Db of the ABC.Com domain.[ there is another virtual host on IMail DB].   Second: how can i add it in the *DNS* as a record, so he will receive and send mails through  [EMAIL PROTECTED]   It seems to be somewhat complicated.   Any Suggesstions will be appreciated. Thanks in Advance   Waheed Malek