Hi

How should I config my dns if I want http://webmail.my_customer_domain.com

I have install the webmail on place on my Raq (horde.org) and how do I so I not need to Install the webmail on every customer?

I use the Tera-byte.com/config to dns

Well, you could probably do it one of two ways. For each domain, enter in a CNAME in the tera dns manager for webmail (adds a CNAME for webmail.domain.com) which resolves at the place you set up IMP on.

You could also set up an alias, similar to what happens when you type in domain.com/admin (there really isn't an admin folder for each domain).

Can the RaQ automatic create alias...or du I need to edit a file and add it for all domains...?

I don't know what you are asking exactly, but maybe if I put it another way. Often people want to create shared cgi-bin type folders that all domains can access. Look for information about creating a shared cgi-bin and maybe that will give you a better idea of what I meant above.